>>5326100Some things I've noticed:
Left: blue stripes in the mouth? also, the orange is too similar to the orange of the middle one.
You should have made him look more too the left. It'd look like he's moving his head to the right and evolving meanwhile.
remove the bit of orange on the very left. it looks awkward.
the middle one: the red on the jaw doesn't go all the way to the other end. there is a gray piece on the inside of the jaw. and a tiny gray piece b/w two of the upper teeth.
Are you sure there has to be a gray and a purple horn? is the pink area below the middle one intended? what about the brown triangle next to it (it seems to be connected to the brown piece inside the mouth of the middle one)?