How cute that it lives in a cactus! If you could bring out the red on the head and lighten up the face a little it would really highlight the bird, I think.
I love the way you captured his environment. This is a saguaro? I would have considered a little dodging on his face to bring the whites out, but still a really nice photo.
I would have dodged the bird's face to make him stand out more here. Great compo otherwise but also the green of the cactus is a little dull I think. It is a difficult shot to make work though.