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I like #4 best because it is more like flight as opposed to landing.
The bird attitude on that one is excellent. You got her nicelly elevated above the bottom of the frame, which I think works best. The background is diffused and sets the duck off sufficiently.
I gather you might have done those with 400 f/5.6 on the BushHawk ? Do you find that BH helps you ? I have no experience with it, but I know a couple of people who swear by BH as opposed to a more conventional lens/camera handholding.
Thanks for looking in and your pick, yes 400 5.6 with Bushawk. I have old shaky hands so the Bushawk does help, especially in low light without IS. Takes a little getting use to but really helps me for tracking IF birds.