I take so long with reference sheets, it's such a hassle... At least I didn't miss anything, right? xD If I did, make up your own markings. There are no markings on the back of the head, unless you want to make some.
Thirteen is basically putty, constantly changing and molding slightly yet staying the same - probably half lava lamp. So do what you please with Thirteen. Draw 'her' as any type of animal, mix 'her' markings around. In moderation, of course - I don't think if you changed EVERYTHING it'd even be considered the same character xD
The one thing that stays the same are the long, floppy striped hyena ears. That's the one signature thing.
Personality: Basically a cartoon character. Thirteen tends to over exaggerate her movements and feelings. She can also take very extreme physical harm without dying (just like any other cartoon character!) She talks with speech bubbles, and has no voice. She's a little bit ditzy and gets herself into weird dares and situations often. She will most often be dressed in 20's swing apparel, or any type of a suit - if not, a band shirt, or something really colorful. 13 will get along with anyone, but really could care less about others feelings - she never talks about anything deep, just makes jokes and off the wall comments. That's the deepest she goes, and if you ever try to bring up something 13 doesn't understand, she will probably stop in her tracks as her brain resets and starts to play swing music instead.
Here is a look at my writing process, from the initial planning stages all the way through scene-to-scene plotting.
UPDATE: I've corrected formatting issues and made the entire thing print-ready by mutng the colors and removing the gradient. It should work for many desktop backgrounds too. Please attribute the file to emilybreder.com and only distribute it for FREE.
Included: ~ My personal method for overcoming writer's block and basic writing process to stay on track ~ The 3-Act "Hero's Journey" model from Joseph Campbell's classic book The Hero with a Thousand Faces ~ Scenes & sequels, plus how to create tension, based on Dwight V Swain's Techniques of the Selling Writer
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It already states in the image but I'll say it again. This is how to draw a basic 3D skull, in actuality, a skull's surface has lots of bumps and is a lot more complicated. This is just a means to help get the basic shape of the skull, the placement of the features, and the overall proportion right.
If you want a step by step tutorial please leave a comment.