7 - Oh, very nice capture, including of the 'reversing' - just the finer details in such a delicate image, in my opinion, need to be 'super clean', to really make this excellent... I can see traces of sharpening/haloing around the beak, and possibly tail and just some minor grain here and there - but difficult, especially as this is likely a very close crop. Even the gray background works well, as it does help 'showcase' the natural colors in the hummingbird.
The humingbird is great. I wish there were a bit more color in the background as the background seems to blend more than show any contrast. It may have to do with how fast the shutter had to go to catch this little guy.