wow, I really like how you have more than one layer of transparency (water n hair) yet it's so simply done, I also like a lot the wide range of hues you have on the last pic (double edit) in my experience purely warm colors always seem to look better when they got purple shadows =) and for a blue that highlight is merging incredibly well. wow I just noticed none of the colors I mentioned actually are there, man you really got the hang of color context
about the tooth thing, I think the jist of the problem is that the upper teeth dont make the skull look symetric, the fangs (canines?) look like they arent even at the same height, try to imagine the set of teeth more 3dmentionally, flip the image that may help you see the tooth thing.