It needs somewhere for the eyes to focus on, right now my eyes are focusing on the branches. But there's really nothing there to look at, other than the branches that is. So I would suggest to add another subject to it, say a silhouette of an owl for example, perched somewhere on the tree.

Or you could balanced the focus out by adding another animal to look at the ground, or someone resting against the tree. Or someone on a tyre swing.

Or...You could ignore all that and go for the disturbing route. Like someone hanging from the tree.