Hey!This is a pretty decent score - especially considering how well your other picture did last week.
I really like leaf pictures. It's spring here so most of ours are green now. I like the color and texture in yours. Detail and clarity are really nice.
I guess I agree with the others about the backlight. The only way I can think of to avoid it easily would be to use a lightbox, but I think that the black background looks much better than white would. The geometric circle juxtaposes with the organic outline of the leaf rather nicely. So... I'm not really sure how you could've shot it better. I wish some of those commenters would've made suggestions on how to avoid showing the light source while still keeping a black bakground.
You also did a nice job with the exposure. The area where the veins come together in the leaf looks a bit fuzzy, but focus overall is good.
Overall, it doesn't really have any major problems IMO. It just isn't a standout macro. (congrats on the ribbon btw)