i think the use of the bars and the shadows is a very effective way to meet this challenge. an image with such striking lines as this one would work well. however, there are a couple of things that might be better.
cropping the image so that the lower right corner might help, as that bit of wall (?) detracts from the patterns in the rest of the image. it would also be more effective if the shadows were only of the bars in the fence; the large shadow towards the top takes away from the rest of the shadow pattern. finally, the image itself is a little small. something like this with strong lines and good patterns deserves a larger canvas. plus, lots of voters tend to vote down images that don't meet the 640px maximum size in at least one direction.
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