I agree with Rob and Markulous, either more sky or no sky.
I really like the horizontal lines and the way they're broken up by the randomness of the leaves, you've obviously got a good eye for a shot.
There seems to be a bit of a yellow colour cast here and I think the saturation's boosted a little high which looses some of the subtle details. I did a quick pimp to show what I mean, I used a curve to remove the colourcast and a hue/saturation layer to desaturate a little bit and then sharpened.
cheers
Dan