Using MS Paint to draw

I've done really simply lines using MS Paint, usually to figure out perspective; but this sketch of a woman (see link) is amazing. Of course, it is a big help to be a good artist to begin with, but this shows what can be done with a simple program (came with my last 3 computers). The trick is knowing when to let up on the mouse and have an extremely steady hand (I don't).

http://sketchingdrawing.com/?p=20

This artist has many instructional videos and well worth the look for all my artsy readers.