Yves
You sure got the little guy sitting up for you. There's a lot of noise in this image.....was it underexposed or perhaps a large crop? I think the hummer is too large in the frame. If this is a crop I'd add some room back if it was there. It would help if the light had been coming across your shoulder at the hummer rather than from his back. To get the right light, you can direct the hummer to just one hole by taping over the others and set it up so that it gets the proper light.
I like the pose of the bird, but the harsh lighting doesn't help the image. I would suggest trying to pick times when the light is better or experiment with flash to control the lighting and produce a better result.