Nice shot. If you have photoshop (I'm not sure about other apps), you could use perspective correction to straighten out the tower on the left. I think that might strengthen this image.
I've seen concrete/stone look like that before. It's when I used too much NI! ;^) You've lost detail with the noise reduction. The motion of the flag is stopped quite nicely. This image could stand a slight shift to the left in rotation (1 or 2 degrees) as it's not lined up horizontally. Good luck in the challenge.
if you are going to get so far out of the box that people aren't sure how you're meeting the challenge, you really need to have an outstanding shot. sorry, but this isn't one of them. it's not that sharp, your horizon is off, and the composition doesn't really offer much.
if you want better scores, maybe check out this thread.
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