I wish the open lower jaw was a bit more parallel to the upper mouth - it has a bit of an odd open duck's beak look about it (like a reptile mouth couldn't actually close in that "single hinge" position,) but it may have had to be that way to achieve the swap-out effect.
It's such a gorgeous piece overall but beyond it in reality being 80-90% Mando Dewback rather than 1977 Dewback, the one thing I really don't like is the green fur choice (the Mando Dewback's fur is sort of greenish though.) The only thing green and shaggy from 1977 is dive-motel carpet.