I is ok, you should draw it with pencil first, then scan it in to your computer. Then color over that. When you draw in the computer, your lines come out all wiggly.
Draw it with pencil so it looks all smooth like your Li Mei. Then It will look much better.
Also you need to shade. You aren't shading at all. So look at some of the other artists work on the net, and see how they do lights and shadows.
When you add that, your picture will look like it is 3D. It will give it a more realistic look.
Also you need to use a better program than Paint. Photoshop is my suggestion.