Well, I'm truly surprised how low this ranked, I really expected it to come in much higher. The only reason I can think of is that it's very similar to your Indoor Macro II entry but it's a good shot despite that and there are often near-identical outtakes from other challenges in the free study that do well; a strange result indeed!
Contrast could do with a boost but this is a great macro, fantastic details, I can see all the little wear-and-tear scratches on the metal. Good composition too, best of luck with this.
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