Here's my two cents worth and I'm being quite nit-picky. I think the rocks along the lower edge are a bit distracting: the distinct cut-off lines and humps lead my eye away from the subject. They might be darkened or cropped differently? Also the two fern fronds look just a tiny bit arranged, almost contrived. Perhaps I wouldn't have noticed that if you hadn't mentioned that you set up the scene, or maybe I am all wrong and they are natural, not sure. Perhaps a little off the top of the frame? I hope this is positive and helpful.
This is a beautiful photo of a beautiful little bird, I love the soft light and colors and the complimentary background, and the way the ferns frame the nicely positioned subject.