Only have seconds to post before heading to the airport. So here's the basic scoop: A shader can turn white to black, orange to white, any color, brightness, or hue to any other. A good skin shader does considerable toning and such.

Poser preview doesn't implement any of that.  In fact, it doesn't even pay attention to the Diffuse_Value.

Try this - attach a color map - just a color map - to Diffuse_Color. Set Diffuse_Value = 0, Specular_Value = 0. Look at your preview - still see the skin, right? But render and it is totally completely black.

Talk to Smith Micro. The Preview renderer is not honoring 90% of what shader components related to light do. The newer hardware previews can sometimes mimic the patterns, such as Clouds nodes, but they almost completely ignore any tricky stuff related to lighting.

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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)