I was checking the program Sketch book Pro, and I find this awesome thing call symmetry Y. I hear a lot that is pretty much a Tablet program, but as far I have experiment it works fine with a Rat too.

Well is not big deal duplicate one side of an image to make it look symmetrical. But that the program reproduce what you do while you are drawing as if was a mirror, is awesome. Maybe you knew of this effects long ago, but this was the first time I play with one of these... This kitty was half the effort xD.