Another pretty Hummer! You are so lucky to have so many different species of my favorite bird. I find the leaves to the right of the bird's head a bit distracting. At this small file size it is hard to see alot of detail. The main focus may be on his back, rather than the eyes, but it sure is a pretty bird. Thanks for sharing it.
You can see from the raised crown feathers that this bird is guarding the area, and this image shows that behavior. I'd like to see the bird placed more to the right in the frame out of the center. The bg is busy, but typical of their habitat. Images of the back of birds will be more engaging if the bird will turn it's head toward you more instead of looking away.
Tom, you're improving quickly. I agree with Linda's compositional suggestion, and though there is a bit too much going on in the background, this is much better in that sense than some of your earlier images. The sharpness and light are nice.