What a lovely background. I could stand a bit more sharpening on the head, and a natural perch would be nicer, but they don't always land where we want them. i would clean up the top of the perch.
I'm OK with the slant on the perch, I just wish it was prettier and darker. I like the pose oni the bluebird, and the comp is very nice and well balanced. Nice BG. Perhaps a tad more saturation would be good.