From:  Frenchy Pilou (PILOU)
And ArtRarge is very cool for repaint an image with painter style!
Put an image as background(tracing paper), and the same image as Import "Image"
So you have directly the color of beginning brushing and always the model when you press the Space bar ;)
Just speedy example :)

EDITED: 13 Dec 2008 by PILOU