The sky seems grainy and a bit of an odd..."halo" like effect - although you may have been going for this look in a photo editing program. I like the tree and the composition.
I like the play of light between the leaves and the ground. I think it could have been better edited, though. Colors seem very flat, and it looks like you may have tried burning in the sky, which left a white shadow around the trees, especially on the left. It also created a lot of grain in the sky.