I've zoomed in to make it easier to see the problems.

See the "warts" - little extra bumps that should not be there? Those are places where there is a burned-in specular on the texture map that we're using for bump. Every bright spot on the texture becomes a little hill. It looks really wrong.

This is why my render of the GND 4 textures was so bad. The burned-in speculars that found there way into the bump map create a warty diseased look to the skin.

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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)