Giant Oyster Grotto Process...so far

Just thought I'ld post some of my concept 2 process to show how its going. Still a lot to sort out before I can play around with colour but it's getting there. Thinking of putting the two nearest pillars in near darkness like silhouettes because they are behind the light source so except some light from the hole in the ceiling and some bounce light from the oyster and pearl they will be barely visible in extreme lighting.