This is my second go-around =) - I like your idea. It has an overall grey feeling to it, I would like to see a little more contrast... or some brighter whites. However, overall I think you did very good =)
I am making two passes on this Challenge. I will vote on your photo then return later(before voting is over) to comment on what I like and dislike about your shot. You can take the comments however you wish and I will try not to be mean. Just don't take it the wrong way.
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Nice. I can't see a thing technically wrong with it.