The diagonal comp is cool. I also like how you used the green border to tie it together. The only thing I don't like is the reflection under the leaf. For me, it doesn't add anything to the photo.
Love the diagonal composition. The shadow adds a nice 3-dimensional element to this, it's almost like the leaf's aura. Lovely! And I really like that you did not make it B&W. The tinge of green is perfect.