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Question about doing colour portraits

Hey how's things? I really like the work you do and find it amazing! I recently made friends with Jinxi through myspace. I liked your portrait of Bjork. All the others are great as well.
Well here's the real question. I was wondering if you could possibly help me. I'm thinking of doing a color portrait and was wondering if to could give me any advice or tips on the process? As well, do you find that you have to do many passes over a tattoo to get the color and especially the black too?
Thanks for your time and any advice you can give me
Thanks again and good luck, Jinx