I would personally rather you didn't put "quills" on any of the ceratopsians just yet.It's just conjecture based on a Psittacosaurus specimen that shows what may be quill like structures (it has unfortunately not been verified as to what the structures actually were since no one will study the specimen due to legal issues with the fossil).
Aw, but they look so cool

Anyway, upon further consideration I'm thinking that quills probably would not cast very well.
Just so long as the "hands" are good and accurate, I will be perfectly happy with this sculpt, even without any conjectural integument. If I may suggest, however, including scales like the impressions from the "Lane"
Triceratops:

Also, wasn't there another Trike specimen that showed square-shaped "scutes" along the ventral surface?