You've find an object to show in miniature, assuming this is the same kind of leaf. Since leaves have no standard size, ranging from quite tiny to enormous I really don't find them a good subject for this challenge. The only reason I would give for this working is if this pin is the same kind of leaf in which case it would be a miniature version. I'll go along with that idea and say it meets the challenge.
The next part is to determine if the challenge was met with a quality photograph--preferably one I would hang on my wall (or could imagine someone haning on their wall). I really don't think this does it. Technically it is fine. Asthetically, the real leaf might make an interesting study in line and texture but the jewelry plopped at the bottom of it marrs that. The two together just don't make a good composition.
I like the idea and the composition. But I personally would have liked to have seen this image with more dramatic light. Maybe with some hard shadows. That's just me though.
cool concept!
Im conflicted about whether it would have been betterfor the whole of the green leaf to be sharp or as it is now. I wish there was more of a shadow under the silver leaf, its hard to gauge its relative position in the space right now...