Hey, looks nice! Reminds me of
Fire Emblem; did you base it on anything? Anyway, your main issue right now is that it needs cleaning up. You have lots of jagged lines and messy shading between the different colors. There's also some banding around the chin.
I recommend smoothing out your curves and adding some anti-aliasing. You have lots of colors; use them! It's easier to explain with a picture, so:
Basically, for curves, the number of pixels in each segment should increase or decrease smoothly. Play with the curved line tool in Paint if you're still confused about how that works. Then, if you have a dark color next to a light color and you have a shade between them on your palette, you should use it to antialias between them so it looks smoother.
As for banding, it's when you have a bunch of pixels lined up next to each other in the same pattern, like:
xxx
yyy
zzz
or
xyz
wxyz
vwxyz
This tends to look crappy, so you should arrange your pixel clusters to avoid it. Helm talks about it and lots of other useful things in
this thread.