First I'd light the scene with orange point lights wherever there is a torch. I'd use the inverse square falloff shader on these lights. Lighting in an enclosed space with a local light source looks fake if you don't do the ISF thing.  If the elemental is supposed to be a signifant source of light, I'd include a point light or two near him, or wait for Poser 8. :-O

Then I'd generate an IBL using my GenIBL tool, measuring the direct illumination in the scene. I'd then add this to create the ambient bounced light. Or I'd wait for Poser 8. :-O

As for the elemental himself, fastscatter is not going to do anything for you. Here's what I'd do.

I'd load two copies of the figure. I'd call the second copy Flames and conform it to the first figure. On Flames I'd hide the eyes, teeth, inner mouth, etc. Then I'd load a good flame shader onto the skin materials of Flames. You probably don't have such a thing, but I do. When I have some time, I'll finish it up and post it. Can't right now because I'm working on Poser 8.

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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)