You did a great job on something you drew with your mouse, and I know how hard it can be. When I first got a computer I tried drawing with the mouse and it was tough. So I just started taking pictures of my works and then traced them and edited them so all I needed to do was add the color and shading. Also if you ever think about getting a tablet or a scanner, you should go with scanner. Anyways, your doing great with this.
