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Thanks, Sharky.

I thought about putting in a floor, but it was 3 hours into rendering when I decided it needed "something more" and I didn't want to lose the time invested already :)

I also thought about a blanket or sheet crumpled up at her feet/side, but had no idea how to go about that (had vague recollections of a dynamic sheet freebie somewhere...)

Also considered a window behind her with moonlight streaming in for a backlight...who knows, maybe I will revisit this. I'd also like to find some more/better candles for the scene.

Anyway, thanks again for commenting.

What about just a plane with a cloth texture applied.. subdivided down to like 5 levels, and then a d-form?  I'm not good at spline editing; but, I saw a spline editing tute that made a beautiful water-drop effect on a flat water surface.  something like that to crumple the plane up.. do that will several d-forms and you have a crumpled sheet.