When something looks good unless or until you change the lighting, the shader is wrong.If you adjust the shader and then in the next light set it works poorly, the shader is wrong. When light and dark seem out of balance, and lighting an object well becomes an exercise of hours, along with shader tweaking, you probably need to start using gamma correction.

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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)