Lovely colours, good contrast of the natural shape and lines of the leaf foreground subject and the geometric background. Contrast of colours also good. Like the composition, especially in the position of the leaf stem. Water also works well for me.
The reason I gave you a 6 was because of your subject matter. Your design elements--spacing, clarity, perspective, even cropping--are perfect. It's just a very cliched, overused subject. Now that I look at it again, I'll add an extra point, because this really is good photography. But it's never good to hop on the bandwagon as a photographer.
I like this lone little leaf. The red colour with the clear dropulets are so real. Also the water on the fence is clearly seen. Placement of the leaf is perfect. I can find nothing wrong with this photo.