Here is a specular reflection of my light source on a very shiny black surface.

This isn't entirely real because a surface like this would be doing a mirror-like reflection of everything in the scene. But we don't need to go there because you want to understand skin, not a bowling ball.

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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)