Attached Link: http://www.ruku.com/tutorials/painterface.html

try my tutorial for painter 6 at Pixart. It's adding color to greyscale images ( in this case a painted face). I first paint everything in greyscale, it's alot easier to get the tonality right. And then i colorize the image from there. Any way ,if the tutorial doesn't answer all your questions let me know and try to help you further.