Try a different technique of shading the hair, skin, etc. It seems a little repetitive and doesn't look very nice to the eye. Also, I would try subtler colours that blend well together, at the moment your two skins seem a little rough edged? Does that make sense? I'm not sure, though I've been making skins for myself for a while now and I've been learning tips and tricks myself. Anyway, keep up the good work.
