I have finished the determining the values and have scanned the original art into Photoshop CS3. At this point I am playing with colors. I am working from from cool to warm. I must confess that I am a novice with color theory. I don't have a formula, I just go with what looks right to me. I've had complements from people who's color work I admire so I might not be too bad at color. Either way, this is pretty much the road map for the color when I start painting.