So incredibly nice! I still haven't started on any dungeon, and I so desperately want to, but I am still unsure how to tackle it. Still, this is yet another very inspirational log to keep track of.
One thing I would add though, is some dirt and mold in the recesses, the parts where the walls and floors meet. That would make it look much filthier and cooler. Just take some brown paint, add water and smudge it on. Then, when dry, do the same with some greyish green.