1) Save as .gif or .png, not .bmp.
2) You have brown outlines on the blue hair, which sticks out way to much. I think it is possible to apply them well, but I'm not sure of that, or how to do it for that matter. If you want, keep trying.
3) Your lines are a bit messy. Maybe use some selout, or just smoothen them out.
4) The beard thing is a bit squarish. Maybe round the highlight under it so that it looks more chin-curved.
That's about it for now. Just a few things to fix...