Did you render with HSV Exponential turned on? Without it, we're seeing everything too dark, particularly in shadowed areas lit only by IDL. HSVE is like gamma correction, but easier to deal with as it doesn't modify incoming textures.

Set it to 2.0 or 2.2. Render again.

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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)