I was thinking of an alternate reason - you mentioned monopod - why the focus isn't crisp on the entire bird. I was just guessing as you did not mention the ss and aperture.
Very colourful fella, too bad the plumage is a little rough around the edges (worn). Good pose, and the perch looks alright too (although it is a bit bright). As to your comp question, yes I find it a tad centered. That long lower leg makes it difficult to crop at left and a well balanced way, therefore I would add some canvas back at right and bottom (if you have it). Thanks for sharing this beautiful species!!