Hmmmm...tough one Shelley?
You've got a great capture here, and I like it. But there's a couple of little things that bother me, that might be the same issues you are questioning.
The tips of his wings get lost in the shadows. And the green is almost overpowering. The birds color is so vivid, it almost makes the center of the frame look desaturated. I'm no expert on light, but I don't see how you could have avoided this?
I made some shadow/hilight adjustments and tweaked the green a little bit. It helped focus on the bird, but I'm not sure it's any 'better'?