I would suggest to try dithering the shades and AA the eye and mouth, I made a small edit to show what I mean:
That's not AA that you added. That's pillow shading, and a big no-no at that.
Seal, I noticed that you put AA/Selout around the face, but it's really too dark to make much difference, especially with three shades that are all so similar. I also see some "AA" around the eye, but the colour you're using to for the AA is way too light.