Im back, and I still can't shade.

[Gors]

I think you know, but don't know how to apply them.

first of all, never use pure white as BG. Use a neutral color (like gray, for example) so you can notice color problems easily.

you have too much colors for a sprite that small, it won't hurt if you cut out some of them. Use a darker outline for the nose and mouth because they're almost invisible.

I did an edit (I cut all the unnecessary colors, fixed some of the jagged lines) because an image tells more than a thousand words.