Way too many shades of green.  I also suggest going outside and have good hard look at what things actually look like.  Look at the colours of things like grass, and think about texture.  Also, though many cartoons and kids' drawings might have you believe that the sun is this huge yellow blotch in the sky, it is not.  I should also hope that you don't go outside and stare at the sun; perhaps a little browsing on flickr might help on that one.  Look at the real world and also go look at the colours in other peoples' works.  Make sure you look at the colours relative to each other and not just on their own.

I've been a lurker here for a bit, thought I'd post something.  This is my first try for the character for the game I'm starting work on.  [sarcasm]Woo.[/sarcasm]  Now, down to business.  I've been working on him for a bit and I'm totally frazzled (perhaps even vexed) as to how to shade his body.  By body I mean jacket.  I mean, he really isn't that strange hue of green... though his skin is white so that wouldn't be all that-- I digress.  I started, as you can see, to shade it like you see.  The problem is I don't want him like that.  I don't want nice flowing folds because I want him to retain his fairly basic shape, not too much detail.  I do, however, want to give him a fair bit of texture and form, not leave him looking so flat.  I'm also rather hesitant as far as his left arm goes.  I want him to end up being a fairly animated and dynamic sprite so please keep that in mind.  Anyway, crits and suggestion are mad welcome, and that doesn't mean I'll get mad at you. 

I would do a straight redo if anything.  It doesn't even really look stylized; to me it just looks wrong.  That is, of course, because the proportions, shapes etc. aren't right. 

Cool.  That's pretty rad.  I think the black outline might be a little heavy/dark though.  Around the eyes(?) it looks really dark.  It contrasts with the soft, smooth white/grays and shading.