Here is a render of all seven materials on seven spheres.

In the bottom row is paint, skin, and lipstick.

In the middle row is skinAndPaint followed by skinAndLipstick.

In the top row is skinAndPaintAndLipstick followed by skinAndLipstickAndPaint.

I think you'll agree this is very well organized and easy to assemble different combinations.

Be sure to click for full size. Look closely at the speculars and reflections.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)