Nice gradiation in the sky, I really would have loved to see a couple of people walking along in the right of the frame; that would've made this perfect. As is, 8
Simple and quiet, and a touch on the plain side. I like the figure at the base of the tree, but it's a bit hard to determine for sure that's a person there (I could be wrong). I also think that for a simple silhouette shot like this in this size (that would be DPC size) you need to have it a bit sharper, crisper. I can see it softer in a larger size.
This has a wonderful zen like feel to it. Simple and stunning. I have seen similar lone tree shots on the site before but the fact that you have got the sun setting directly behind the tree really adds a new and beautiful quality to it