Personally would have cropped more of the top gangway off to leave only the Z but the colours work great, did you try a polariser on this to reduce glare? Would be interesting to see if you did with another shot!
I do enjoy this shot and feel it works well. It does fit the challenge however I feel that if you cropped just a little more off the top it would help pull your eyes into the Z. As it is now I keep looking at the top of the image first and overlook the Z. If I wasn't looking for it I probably would have paid little attention to your Z. Otherwise great image with nice, color, great contrast, and a nice crisp focus. Great job.
This is neat..I like the way you captured the image. This was a very creatice idea, and i like the way that you can see every bit of texture int he bricks. Awesome hsot.