You can desaturate, for one thing. Something I have been playing with lately, which may be of interest, is adding a very subtle marble effect over skin. If you have a marble pattern generator/filter plug in, set the dark and light colours either side of your texture base colour, add a fill to a new layer, then blend it in using opacity. You can also experiment with the blending modes to produce different effects. A small scale marbling produces very realistic skin variations. With the right colour combinations it's also great for making realistic vein patterns for eyeballs, too.

Coppula eam se non posit acceptera jocularum.

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