This image looks like it was shot pretty wide, creating a what (I suppose) you'd call rectilinear distortion at the periphery- everything gets stretched out there. To my eye, your composition has also created a focal point at the center of the frame. I tend to gravitate toward these sorts of images, because they act like a sort of vortex, pulling the viewer into the shot.
In order to increase this effect, I'd recommend a gradated burn from the bottom central 1/3 toward the center of the shot, in a triangular fashion, with increasing burn from peripheral to central. That might create another "arm" or two which can also reach out and grab the viewer. It would also add interest to the foreground, which is probably the weakest element of the shot as it stands now.
Overall, very cool.
Edit: On further inspection, I now think that maybe the shot wasn't so wide after all, and that the distortion effect might just be the way those tree branches hang. Only you can tell us