The silhouette part might be to dark, well at least on my lcd screen ... I know, I konw ... lcd screen isn't the photographer's best friend :-)
The idea is at least good.
The branches in the upper left are distracting, and under these rules, could have been cloned out. Rules of thirds, you want your horizon I/3 from the top or bottom. Nice color, focus and contrast. Hope that helps, good luck!
I would of cropped tighter, maybe get rid of the random tree branch in the upper left... it's just floating in space. This is a nice image but not a silhouette IMO.