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Exposures are spot-on with beautiful color, and detail is nice and sharp Birdie.
I've always enjoyed your compositions and feel like you leave space because that's what you want the image to be... not because you don't have the pixels to crop tighter.
Congrats on the Mallard IF, it's my favorite.
Just keep shooting, you produce very fine images. When I go to the ponds for ducks, I literally shoot several hundred images... lots are technically "keepers" but typically there are only a few that have everything I was looking for in the image and those are the few that I post... but that's just me, and I'm much pickier now than I used to be. In other words, I just keep shooting til I get the one I want.
Post what you like and what you are proud of... trust your instincts and your eye, you're an excellent photographer.