I prefer muddy ground for late cretaceous....late cretaceous was humid!
I believed late cretaceous was a colorful world...colorful flowers and some insects related to flowers (ladybirds, moth, wasp), birds with pretty voice, blue and green dragonfly, slimy snail, fruit tree exist in late cretaceous....volcano and dust air related to volcano smoke and flowers pollination exist....you can add such things to your pictures for making a better imagination about Tyrannosaurs and ceratops life.....
I hope my advise do not make you angry...it is just an friendly advice from a lonely biologist.....I always like your art very much!
Best wishes for you and your family, your brother always, Amin Khaleghparast (a lonely biologist from Tehran, IRAN)
Beautiful, excellent color patterns and shading. The frill is amazing, that's definitely the hardest part of this animal to get right.
Suggestion: the portion of the snout between the beak and the nasal horn needs to be longer. It's fairly long in Pentaceratops, in fact most of the snout is in fron of the nasal horn - the horn itself is bunched up pretty close to the orbital horns (in such a position so as to be almost useless for attack or defense despite its large size for a chasmosaurine nasal horn).