Two different facial expressions c:

Love the palette and shading/dithering job!

I like the tilted angles of his face and texture of his scalp. Dude looks deranged.

 the lighter highlights aren't really needed for anywhere other than the twist up on the left half of the lip, all in all a pretty cool piece though. +1 approval

Nice to see you working at a controllable size ;)

You should now exercise that control! Lines need to be smoothed, pixel clusters to be polished.

Palette could probably be unified a bit, right now there are 3 distinct sub-palettes there. They need to talk to each other!

Pretty cool shading and great atmosphere =)

I think this could be impproved by using a different color for the eyes than that of the skin. When I first saw it I thought it had about 4 colors, and I was going to suggst more to get some separation of the eyes.
But, having 10 is enough and this should be a priority.