First off, I like.
I do think that the horizontal and vertical window frames are a strong compositional element. The fact that these are non-symmetrical within the frame comes across as a bit of a distraction to me. I know that perhaps others may see this as a source of tension withing the composition, but I think it makes them more obvious than they should be given that the reflections are the interesting part of this abstract.
Otherwise I like this very much.