Lovely duck. Sharp, well exposed, nice background, great legs.
Wish there was a bit more clearance between the birds tail and the vertical part of tree. Better yet, lost the vertical part altogethor. A step to the let would have helped with the branch, but then head position would have been worse. Always trade offs!
Killer rich green BG - looks to be in sun. Duck looks great and exposure well. Some fill-flash would have been a big aid here to brighten up the duck and make him pop out of that BG. I agree on the tail touching the branch.