Stegoceras validum, a 2m long pachycephalosaur, looks even more diminutive next to Striatornata plants. Striatornata sanantoniensis is known from fossils further south alongside southern species of Steogceras, but similar species may have existed in the Dinosaur Park Formation with S. validum. Striatornata bleonged to the Musaceae, a group of plants including ginger and bananas. It appearance here is based on the later Spirematospermum (which could grow up to 3m tall) but with shorter, stouter seed pods, which look especially delicious to the little pachycephalosaur.
3469x3382px 5.16 MB
© 2013 - 2021 MattMart
No, the intent is to show quills on the tail. I did not draw scales on the body since basal marginocephalians like Psittacosaurus seem to be covered mostly in tiny reticulae, which would not be visible outside of an extreme close-up (your versions seems to have more Triceratops type scales, but other ceratopsids also show mostly standard reticulate pavement scales so I'd say those big polygons are unique to triceratopsines).
Feathers on pachycephalosaurids are currently equally likely as no feathers. At least, psittacosaur-like quills.