The composition of this photo is amazing. Leading lines, diagnals, rule of thirds..all great.
The only thing that doesn't work for me is the colours seem a little flat and dark. I get that it's not exactly an area that gets much light, but I feel like it needs to be either higher contrast/darker and/or a colour adjustment would help.
Personally, I would slightly raise the contrast and brightness, as well as adjust the red, blue, and green levels. I've found that in photos where the subject has more muted tones, changing the hue or levels brings a little more "life" so to speak, into them. Other than that, it really is a lovely photo.