When I look at the above 2 pictures, there are 2 things that feels slightly odd. The floor and the wall at the end of the cathedral feels a little blank. This might be intended for the floor (having a shiny surface is okay), but the wall just feels a little empty. Screenie to see what I mean:
By the way, that is my only "complaint" as the rest is formidable enough!
Perhaps having the wall get the same texture than the rock texture would be nice.