Paint IS good for something. Drying. Ever watch paint dry? It's like playing JKA on my computer, 10 fps of pure exitement. Anywho, for only having paint I'm pretty impressed with the skinning job you've managed to pull off. I would suggest getting gimp though, it's free, easy to use, and if you ever decide to move up to something like photoshop you'll already have the skills to use it.
Yes I have download Gimp and photofiltre and I try to make good textures