Amendment to my 'during challenge' comment: I was wrong in thinking some of the graffiti was PS'd in. A testament to the excellent lighting and post processing.
Hope I'm wrong, but looks like you photoshopped much of the graffiti in. Didn't do much for the shot anyway. Overall, it's just relatively uninteresting to me.
I find this image's subject to be very interesting and worth the snap. Like the B&W handling of it as well. Camera postion in relation to the subject may make the image more powerful....6...