Not bad, anon. I seem to remember trying a couple of those myself and having trouble with the linework, getting impatient and just upping the half-done WIPs :)

If you're using Vista / 7 / 8 paint, btw, a hint to nix those somewhat obvious jaggie lines: Use the "brush" tool to finesse things. In all but the smallest size (where it's basically the pencil), the edges are somewhat anti-aliased, so you can use it as a crude smoothing tool so long as you're careful to pick the colours in the right order (so as not to leave a big obvious block or an overtly rounded edge).

Who needs photoshop :D