OK so here's where we're at after reworking the wall effects to give it height.

Guirren Villus Crypt Level 1.jpg

wdmartin here are the settings I used to fix the walls. They are the same as the cave.
Outter Glow.JPG
Inner shadow.JPG
Bevel and emboss.JPG

After i drop some assets into the map I'll try your suggestion for the shadow.