In photographic terms, the interior of the enclosure in that last image was underexposed by about two stops. To adjust "exposure" I can simply increase my light source intensity. It was 100%. Now it's 400%, corresponding to a two-stop change in my camera aperture. Let's pretend the first image was shot at f/8 - then this one is shot at f/4.

Now I have correct light levels for a nice exposure (as shown by the light meters) but my artifacts are really bad.

You just can't do this picture correctly in Poser.

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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)