Awesome work. FINISH IT!
Heh.. actually, I should critique (that's what I do!).
Pink on chin could be smoother, more diffused.
Forehead has no dither for that dark shade near the right by the outline.
Need to AA the bottom eyelid.
Your darkest red hair shade is too dark, I think.
Here's a technique I would like to share with you:
It's called interlaced dithering. You should be able to reduce your palette by about 20 percent with this technique. But even if you don't reduce your colors, it should help you out.