If you already have some good hi resolution photos, my suggestion would be to draw the outline youself. You mentioned you have photoshop and illustrator, and both those programs have the pen/bezier tool. If you're not comfortable with those tools yet.....then you should definitely practice. That particular tool you'll find to be one of the strongest in your arsenal. You can make the outline in either program (I personally believe it's easier in illustrator) then on your photoshop menu use the Select> Color range option to select particular colors, play with the fuzzines slider bar in the pop up window to get the range you want. Create new layers for each individual color and with each individual color range still selected, fill each selection of color into the individual layers. From there you can create halftones if needed. If you're not familiar with how to do that...then that will be a whole other deal. I guess what I'm trying to say is that the best way to do things is by learning how to do them yourself or learn from somebody that knows. Hope that helps.
