I see your vision. I like your composition. The tree branch crawls out over the distant rock outcrop, nicely following the contour of that outcrop - did you intend this? The owl is a nice touch, but it should be demoted in the scene because it looks modeled (like a decoy). Lower the view so the tree's base is eminating from the ground. Widen the field of view so that you have more branch in view - that branch, being barren, brings drama to the image. Examine your clouds because they look a bit on the fake side. They don't need to be that dark for good effect, but if you want to keep them that dark have one releasing rain in the distance, maybe even a thunderbolt way off.
-Pat