Your composition works well here and would work better if the bg was just a little less busy. Its unfortunate that the tail is somewhat behind the rock. I like the nice green and rust colors. If this were mine I would try to lighten the shadows near the bill and eye area and perhaps tone down the brightness of the rock a bit.
You have nice colours on the bird and a good pose, pity the tail is cropped. The lighting here looks a little harsh and its probably created the bright green patches in the BG which compete with the bird as well as creating the shadows about the eyes & beak. I agree with Cheryl about toning down the rock also..