Thanks everybody.

Yeah, the double shadow is to simulate light sources inside the cavern, possibly from multiple sources. There's an outer glow on the walls (in black) to hide them in darker shadow. The troll and prisoner definitely need some sort of shadowing though.

I think I'm going to walk away from this one for awhile. If anyone still sees the face/vase thing going on, let me know.

As always, thank you so much for the invaluable input and suggestions. This is why I really love this place!