It probably is a little more complex that simple math. I don't know the formulas used in some of this so figuring that all out would require a little digging on what they actually are.

This is promising thou, I just a few hours of experimenting I am getting very good results with 1 light for shadows, and 2 emitters set to 4 amb. IDL level is set to .1

I am up to 1.2 on the saturation of the textures as well. When this one is done rendering I will post it and the settings I used for it. I am using on of my textures with lots of tattoos to see if it works with them as well.

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