your subject should be higher in the shot. the subject gets lost in vstness of the room. if you brought it down just a little you would keep that feeling of vastnes nad not loose the subject.
I think you got "silence" in this image. At first I really loved it and I still like it, but now I'm bothered by the position of the chandelier. Maybe you could have cropped a bit lower, still getting most of the railing? I dunno. Maybe it's just me. Contrast seems like it could be stronger, too. Anyhoo, I did give this picture a 7.
Nice composition - I like the idea that the main figure is almost something you notice after looking for a while. Emphasizes the feeling of silence and aloneness in the large house. A much wider-angle lens would have intensified the feeling even more - possibly hard to do, depending on your camera.