Nice shot - sharp, good view point, focus bang on.
A couple of suggestions which I hope will help:
1 There is a lot of bright background which is causing some under exposure of the Robin. Try setting +1 exposure compensation on your camera. This will tend to overexpose the background but will increase the exposure of the Robin.
2 I would be tempted to go for a square crop with the bird to the left. This would eliminate some of that distracting background.