Beautiful Image of the Hummingbird,Peter.Impeccable details and tack sharp.Lovely BG too.Great Work.If I have to nit-pick then I would like to tone down the highlights on the branch at right bottom corner of the frame.Nevertheless,its a great shot.
The darkened perch looks better in the repost, but I would reduce the purplish hue you got there and I would also tone down the bright area at left edge too. Lots of good details on the subject but for some reason there is pixelation on the BG. Subject a bit large in the frame IMO. I like the crystal clear eye and raised feathers on the head!