It seems a little flat -- perhaps some more density in the mid-range (in photoshop/levels/ slide the middle -- gray -- slider to the right) would dramatically improve the shot. Also, since the sky is almost totally blown out, re-shooting with less exposure would be appropriate as well.
Composition: Subject Placement, Cropping, Background 8
Technical: Focus, Exposure, Lighting, Processing 8
Appeal: Is it Interesting, Motivating, Etc.? 5
How well does it meet the challenge: 7
Total Averaged Rating 7 Dick
It illustrates proportion but I don't really like the shot. Perhaps if you had moved around to the other side, placing the sun over your shoulder instead of behind the tree? There is that large expanse of overexposed sky that just detracts too much from the subject. A vertical composition probably would have worked much better. You could have cut out all the distractions to the right and left and the vertical image plane would have naturally led the eye upward. My eye keeps wandering off to that other tree and to that hot spot instead of focusing on the central tree.