[RitterCat]

DV317: It looks good, but I think it's a bit squashed. Even though not the whole box will be used, it only fills half the space vertically, and nearly all horizontally.
Wyverii: The proportions look a little off, or it might just be the pose, but I think the head crest is a little small. I don't know, I just get this feeling it's not quite right. It probably is though, so you can ignore me as a noob spriter
Aragornbird: Basically what everyone else has said. It's a bit too intimidating and fierce. While it is fierce, it's more in a silent glare sort of way
Anyway, just my two cents, take from it what you want.