A few things.
To me it doesn't look like it was carefully composed. The arch is there, but it doesn't look placed in the frame. Sure it's in a third area and its pretty balanced, but it doesn't really demonstrate any significance to the building. It's just sort've and arch. I think that's the problem with the whole Rule of Thirds thing. It's not a take-all guarantee for a good shot. Try experimenting with different things and see what happens.
The lights on the bottom of the arch are over-exposing the supports.
Also, be careful when photographing words. When the eye sees them, we instantly try to read it. In your case, the shadows from the lights has made most of the text illegible. Had you not provided it with the title, I'd probably still be sitting here trying to read it, or would have just passed over the image all together because I couldn't figure it out and got bored with it.
__________________
7 d | g l a s s | n e u t r a l d e n s i t y | l i g h t | p e r c e p t i o n
|