Well I liked the high key contrast between the squirrel/tree and the sky and the main brancj running allong a rule of thirds line gives it a very strong composition...I may have preferred slightly fewer twigs in the shot to bring out the isolation part...but what can you do?
Nice! My only suggestion to enhance this shot would be to try for a different composition. Perhaps taking the shot at an angle, so that the branch created a diagonal line would make this slightly more interesting to look at...however, the strong contrasts here are great!