Thanks for the positive feedback - seems I achieved the desired effect! Alas, not translating to a win. My free-fall in the standings continues unabated.
As to the lighting rig: two tealights, one about 10cm directly to the right of the camera, and the other the same distance out to the left but a bit forward (roughly even with the cultists). Both candles are no more than 5cm outside the visible frame. There was also a minimal amount of ambient light in the room (single shaded 40w bulb, about 15 feet away). Word of warning if you try this: if you have to move some models or scenery around, do
not do so while looking intently at your viewfinder! Unless of course you happen to like the smell of singed hair.