Chibi Self Portrait WIP

This is a little chibi that I started yesterday as a sketch in my sketchbook. About 6 o'clock this morning, I decided I would try to further my Photoshop skills, and I'm liking how it's going so far. I started by going over the sketch to do the lineart in CS5, then I erased and cleaned any lining, making certain lines thinner, and some thicker. Then I started adding color. I'm having fun with this, eventhough it's extremely tedious.

Photoshop CS5
Wacom Bamboo Tablet
Acer Aspire 5336-2460 Laptop
4.5 Hours (so far...)

Please give me any pointers you may have. I'm looking to improve.