Notice how the outer ring, which measures specular, is almost black. In Poser, IBL is not used for specular (too bad). By having the 100% IBL and relatively weak main lights, your specular effect is completely unbalanced. The two parts should be roughly equally reacting to light.

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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)