128 colours? The shading looks like it was tooled, not pixeled by hand.
Your line art looks fine, not quote like a crock, but still an interesting creature. However, I'd rework all the colouring. Not only does your colouring not look pixeled, it doesn't really have a light source, nor does it help define the shapes of the head. Really think about this in three dimensions - you're using foreshortening which can be difficult to begin with, but really take the time to visualize how the light would hit the shapes of his head. The back of his throat and tongue should be in shadown, there should be shadows on the bottom of his upper lip and under his chin, and those teeth and eyes need some shading.
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