Couple of quick points: as presented the image lacks contrast and, well, 'ooomph' (to use a technical term

). Making a simple 'S' curve adjustment and boosting saturation a little in Photoshop works wonders.
Aside from that, I think pulling the tripod back a few steps (or fitting a wider lens, of course) would have allowed you to include the whole tree. It would have been nice to see the tree's shape set off against the blue sky.
Another approach would be to go for a lower angle and make more of that single leaf floating in the foreground...
Anyway, niggles aside, a fine image!
