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About Digital Art / Professional Sean ClossonMale/United States Recent Activity
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Sean Closson
Artist | Professional | Digital Art
United States
Sean Closson is a New England based illustrator/designer with over 10 years of professional experience working in a variety of fields. Some previous work experience includes:

-DVD Box Art for IFC Films
-Prop Design/VFX Concept Art/Storyboarding for .45 Calibur Films
-Concept Art/Game Art Asset Creation/Game Character Animation for Trout Brook Enterprises
-Blog writing/illustration for Socially Stunning

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-Available for Comissions

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Carnotaurus sastrei

Final for Carnotaurus sastrei. A farely large predatory dinosaur from the Late Cretaceous (72 – 69.9 million years ago), it is mostly defined by it’s short bulldog like skull sporting 2 large horns mounted on it’s brow just above the eyes. The bull-like placement of the horns were not lost on the scientist who discovered it, José Bonaparte, deriving it’s name from the Latin words meaning “meat-eating bull.”

It was a member of the Abelisauridae family, a group of predatory dinosaurs that dominated the southern continents during the Cretaceous, it’s thought that the lack of Tyrannosaur competition was one key to their success.

Coincidentally the 1985 Argentinian expedition on which Carnotaurus was discovered was the same expedition that Amargasaurus was discovered on, a bizarre sauropod dinosaur that I have previously rendered. The original specimen found on that expedition was even found with skin impressions, including some on the skull, the skull impressions were however sadly destroyed during excavation. The impressions showed an animal that was covered in scale fairly uniform scales.

Recent research has revealed that the muscles that connected the animal’s tail to it’s thigh were extremely large and would have pulled the leg back for a very strong running stroke, leading scientists to theorize that Carnotaurus was a very swift runner as it was also relatively lightly build for it’s size, weighing in at around 2.2 to 2.3 tons, which is light for an animal of roughly 30 feet in length.

Given it’s almost completely useless forelimbs and the power of it’s legs, it’s appropriate to think of Carnotaurus as a 30 foot horned cheetah, spending it’s time sprinting after smaller prey and gobbling it up without a second thought.

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Triceratops horridus

Final for Triceratops horridus, a Late Cretaceous (68 – 66 million years ago) herbivore, the first of the horned ceratopsian dinosaurs to be discovered. It’s remains were originally found by Othniel Charles Marsh, in the spring of 1887. though he thought that the fossil cores that fit the animal’s brow belonged to a species of extinct Pliocene Bison. It wasn’t until 1889 that he realized his error and named the species Triceratops, meaning “Three Horned Face.”

Marsh’s discovery became the most well known genus of the Ceratopsidae family, a large and varied group known mostly for the brilliant horn and frill displays they possessed. While the facial protrusions of Triceratops and it’s kin look to be purely for defense, many of theorized that the wide variety of horn and frill combinations might be mostly for display, either for attracting mates, or perhaps species and gender identification.

As of 2010 and 2011 several specimens of ceratopsians previously thought to have been representatives of other species, such as the larger Torosaurus, have now been theorized to actually have been just stages in growth of Triceratops itself, this research is based on comparison of 28 difference specimens that were confirmed to be Triceratops, 10 of which could be positively placed in order of a growth series, showing a pattern of growth and changed, particularly in the frill shape, size, and horn shape. Younger specimens show smaller horns with the brow horns curved backwards and a smaller pushed back frill, lined with individual triangular spikes. As the animal grew, the frill became broader, the frill spikes fused to the rest of the skull and became more rounded, and the brow horns grew longer and moved into a forward facing position. This theory is still being debated as it applies to Triceratops and several other species of dinosaurs, more specimens need to be analyzed to determine if this is true.

A fully grown Triceratops measured around 30 feet in length, weighing in at roughly 5.5 tons, It’s head made up around 5 feet of it’s total length with 3 feet of horns attached above each eye.

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Spinosaurus aegyptiacus

Here is the final version of the 20th addition of my Acient Life series: #Spinosaurus aegyptiacus! Named for the enormous neural spines running along it’s back to form what most have theorized to be a large sail or possibly a hump-like structure, Spinosaurus was first uncovered by German paleontologist Ernst Stromer in 1912 while he was in Western Egypt in the Bahariya Formation. The fragmented remains looked to be from a very large and unusual theropod, possibly one bigger than the famous Tyrannosaurus Rex, which had been discovered less than 10 years prior. Unfortunately the museum holding those remains was destroyed in a bombing run during World War II, but detailed drawings of the fragments did survive along with photos of the display.

Over the course of a century of looking, very few specimens of Spinosaurus have been found and none of them were complete, it wasn’t until a 2014 paper detailed new specmens that were found to show the hind legs of the animal, changing how we thought of it as a predator completely. Those legs were short, much shorter than other animals even close to it’s size. Combined with oxygen isotope research that appeared to show similarities to animals like crocodiles and turtles, it looked now like the animal was most certainly adapted more for water than dry land; however a paper that came to my attention recently actually showed research that suggests that the animal could walk on land much better than first thought and that it’s swimming prowess in deep water was less than ideal due very much to it’s narrow body plan and the height of it’s sail. It now looks like it was less adapted for the water than we thought, but it still most likely hunted on the shoreline or fished in shallow water. It doesn’t change things much, but it does look like the animal was less of a croc-o-duck and more like a croc-o-bear, grabbing prey while wading into the shallows.

Because of this new research, I decided to make the background water a little more symbolic. It’s not impossible for the animal to have swam like this, but less likely than it was yesterday.

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Stenopterygius quadriscissus

A member of the icthyosaur order, Stenopterygius was a marine reptile from the Early Jurassic period (183-179 million years ago). At around 10 to 13 feet in length, it was similar in size and body shape to it’s better known relative Icthyosaurus, of which the first skeleton was discovered by fossil hunter, Mary Anning. Despite similarities, Stenopterygius had a smaller skull and more narrow flippers than it’s more famous relative, but the fossil finds of this animal are perhaps even more amazing than that of any other icthyosaur.

Several complete and nearly complete, articulated animals have been found, including one famous example of a mother and child who died while giving birth. It is because of this fossil that we know that icthyosaurs, despite being reptiles, gave birth to live young and that those young were born tail first like modern day whales and dolphins to prevent the babies from drowning before fully clearing the birth canal. Like dolphins and whales, icthyosaurs were air breathers, so they and their young would have to swim to the surface of the water to take in oxygen right after giving birth.

Based on fossil stomach contents from a variety of specimens and the shaped of it’s teeth we can safely say that Stenopterygius probably fed on a diet of mostly cephalopods and fish, and based on it’s body shape and size we can estimate it’s cruising speed to be similar to that of modern day tuna, roughly 40-50 miles per hour.

There has been some preserved skin from another icthyosaur that gave scientists enough melanosome data to get an approximation of the animal’s color. This piece was reconstructed based on that data, which showed the presence of darker colors, like black, grey, or dark brown. I decided to present it with a bit of a marbled texture after looking at some darker colored reptiles and modern day cetaceans (whales and dolphins).

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Comments


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:iconashleyxbrooke:
AshleyxBrooke Featured By Owner Jul 20, 2018  Hobbyist Photographer
Hey there! :la:

Nice art :wow:  If you're ever looking to share your work with other people, live, you should check out #ThumbHub on dAmn (Did you know we had a chat system!? A lot of people don't :( ) We get a lot of great artists popping in to share their work and it varies from Traditional art, to photography, to poetry :) Also a great place to gain more exposure for your art AND to make some new friends xx


Hope to see you there some time :heart:

:gummybear:
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:iconwendymitchell:
WendyMitchell Featured By Owner May 3, 2018  Hobbyist Traditional Artist
Welcome to :iconcrazy-4-animals: :wave: We are really looking forward to seeing all your best animal pictures. Before you begin please read the Submission Guidelines here crazy-4-animals.deviantart.com…  Please make sure that you submit to the correct folder or your work may be declined.
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:iconastralseed:
Astralseed Featured By Owner Mar 30, 2014  Professional General Artist
You've been featured here to help gain a bit more exposure to your art fav.me/d7c8y5t :aww: 
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:icon0coffeeblack0:
0CoffeeBlack0 Featured By Owner Mar 30, 2014  Professional Digital Artist
Thanks, much appreciated.
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:iconastralseed:
Astralseed Featured By Owner Mar 30, 2014  Professional General Artist
You're very welcome :)
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:iconjessicamariana:
JessicaMariana Featured By Owner Jul 4, 2013  Hobbyist General Artist
Thanks so much for the Watch :D
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:icon0coffeeblack0:
0CoffeeBlack0 Featured By Owner Jul 5, 2013  Professional Digital Artist
No problem, you do great work.
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:iconaugustustodopoderoso:
augustustodopoderoso Featured By Owner May 29, 2013  Professional Traditional Artist
Thanks a ton for the watch, Sean.
All the best, man!
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:icon0coffeeblack0:
0CoffeeBlack0 Featured By Owner May 29, 2013  Professional Digital Artist
No problem, you do awesome work!
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