This little guy might end up being a pivotal character in my film senior thesis. Of course, I'm new to Maya, so much of my questioning here will be related to him. Unfortunately I can't begin until I get the full version of Maya instead of the PLE. Anyway, a few edits:

The animal's horn/spike on his head will be changed to one on each side, and curving down to his chest. They will act as a sort of natural armor and defense for the rider as well.

It will be based on brown colorations instead of green.

It will eventually be emaciated.