There's something else I'm kind of stuck on... introducing Sisko. I can't figure out how to colorize white skin to brown. I assume that there must be a reasonable way to do it. First, I tried taking a copy of the hands, perform a desaturation, then try to introduce a brownish tone. I couldn't get Photoshop to give me brown tones. I also tried simple hue shifts and darkening... wouldn't work. I then thought about trying a color matching from his facial skin tones, but that seems way too tedious. Any ideas?
Use the desaturated hand by duplicating it, putting the copy above the original, and setting the blend mode to multiply. Then get Sisko's skin color and use the pen tool on a blank layer placed between the hands to outline the hands (make sure not to include the nails). The hands should be the same color as his head.