Nice dino, Marc. I would definitely do a version with its beak closed, but I think this stance is quite universally usable. Most time they would have been hopping around with their mouths shut. That would be more ideal for 'quiet, unaggressive' images with some dino's in a plain, wood or in a muddy creek. There's enough violence in the world already!
I think, but there has been some other ideas lately about very bright colors, that they were mainly 'lizard colored', but as you know, there's huge variety in lizard colors. But if you post this, why don't you add the plain UV map, so everyone can color the way they want?
---Dune