Nice display of the speculum, green on rump. I like his angle in the frame, his slight rotation towards us. You managed a pretty even green head, which can often be a challenge with these fellows.
Excellent capture David. There is a bright bit just over the eye and trailing behind. I don't know if that is a selection mistake or if it is natural? I would remove the lower smaller highlight in the eye and the highlight on the eye ring....doing so will make the image look clean and sharper.
Hi David a very nice capture of the Mallard , love the pose and the overall comp/crop . The BG is adding nicely to the overall look .
I would not change a thing .If there are water droplets creating HL , just leave them as they are it is natural and not a distraction in my eyes .