Very nice pose and what a cool species! It seems to me that the light ring on the neck is a bit hot so I would suggest a selective adjustment on this area to recover the whites.
Excellent Simon Can also add that I would like the bird moved down the frame a bit to have more room up top !! Beautiful bird and setting !!! btw excellent exp but not sure why would you use partial metering?
As you've already stated, you would have cropped differently. This is a splendid species, one I've not seen before. The exposure is nearyl spot on; BG is complimentary and the perch in it's diagonal orientation lends to the vertical crop, as does the long lines of the bird, particularly the tail. I would agree that a small amount of selective Post Processing would benefit the ring in the neck. That being said, this is an over-all good image. Well done. ;-)
I'm personally fine with the top to bottom ratio, but I would place the subject further to the right. Beautiful species - I love the hint of lime-green on the rump.
Thank you all for your comments. Here is a repost with a different crop. I also multiplied the highlights to get more detail and intensity in the plumage.