I love the sharpness and the texture, lines in the rocks, and the reflection in the ceiling is very pleasing to me. If you can shoot, I wonder if you can get another person to stand (or an ordinary object) somewhere to really give it scale. But I could understand how that could affect the aesthetics, also ...
Am I correct in thinking you used a fairly wide lens to capture this? When I've used my 16-35 I think sometimes I've actually reduced the scale by compressing so much into the image.
Very nicely done. I looked for a while and ran through different things I might consider changing but couldn't find anything that I thought would make it any better. It's kind of a classic composition.