Dont find this subject very interesting. Its possible to make fine images out of trees and the sky but then they have to show something wich catches the eyes for instance some cloudshapes or some interferance between light and shadowes (or interesting colors when they are avalible). Also the trees are out of focus or somehow unsharp.
composition is very important to an image.. this one has none.. the tops of the trees, the blankness of the sky.. makes one wonder what the image is of..
Potentially a good choice of subject matter. But there's no life in this photo. the sky is bland and washed out. And a composition like this needs to work hard to make an impact. Conventionally lookign up and cutting the bottom half of of trees is not appealing unless there's somethign strong to hold ones attention 'up there'