ok , well, i was going to edit just to fix the mouth, but i edited everything.

http://imagehost.ensellitis.com/imagesv2/7295517086headedit.gif

i cut some colors in the hair, and i also didn't find the color very appealing but you can do what you wish with it. i made the face clearer and added some AA in places. I also strengthened some highlights.

here is the comparison
http://imagehost.ensellitis.com/imagesv2/7130991854headedit2.gif

That would be impressive if that were my first ever ^_^;;

And alkaline- those dimples are supposed to be the edges of the mouth.  It's a very wide grin.  Too disfigured?

looks nice. i would make the face more readable by removing the dimple things? the mouth gets lost a little too.

That's pretty good for your first pixel art!