Random sprite

[Chris2Balls [:B]]

you're shading it in the opposite direction of the light source.
what i suggest you do is put in some yellow highlights on the corner of the teeth, as the light source is in a corner. giving more volume to the teeth will also make the sprite more readable.
here's a quick edit:

i think your sprites looks great and it reminds me of megaman. i can't wait to see the rest and more progress!