I understand your troubles with the scanner/photography issue for drawn art. *jimhill01 has a light table for taking pictures with a camera mount for taking pictures; that might help you out as well? I don't think it was very expensive to buy/build.
My art teacher had something like that. It's probably not gonna pop up anywhere in my future any time soon, though. I might just edit stuff in a program by darkening it a few notches, nothing special. I did that once and it looked closer to the original.