I'm not sure that the eye sockets are too small, but I do think that the nasal cavity may be a bit high up. I'll definitely see what I can do about that.

The nasal cavity looks pretty high up, and the eye sockets are undersized. Good palette, and I think the cel-shaded look is a nice one.

Hmm, that does sound interesting. I'll have to try that!

You should try dithering the shading and highlights on the skull to make it more smooth, unless it's a stylistic choice to give it a kind of "toon" look.