Attached Link: http://www.renderosity.com/mod/gallery/index.php?image_id=1326856&member

Opera, Morris has, on several skins added a shader network including displacement and spec maps. Along with the bump you would expect. She offered one of the 1st displacement maps (I saw) for V3. I cannot yet access my Runtime to quote a name.

Over/under (creative,, I know).. I mean diffuse color / deep skin color (creases, pores, even ruddiness),,, masks. I'm reading "Essence.. The Face" and I think it (some of it)is possible in Poser. If we get 64bit later,,, it will be, no doubt.

Some light gets absorbed into skin, bounces about and exits. Some is reflected. This becomes visually apparent on dark skin with lots of specular.
Not sure if "reflect" is the "correct" node to use anyway. My tests have been less than stellar. Perhaps I'm wrong... I do think a high res texture is still "it" for the closeups so long as you can have full control of the lighting conditions. Or, tooling out all the creases, shadows and specular highlights from a store bought reference, a must.

Attached; reflection "idea" on skin.