I like the color tones on this silver_appleyard and find the creature striking Morris, but as I find with some textures and colors, they throw off the autofocus sensor for some reason... I have this trouble with certain white flowers with a yellow buttercup type tinge, in a similar brightness range as your duck... some of these appear back focused towards the wing detail to me, or am I seeing things? With that in mind, 1 and 2 for me as the best in that department, but I love 5 for its character giving you a sqwuack. I apologize if I am off base, and if I am right, I hope you get another shot at it.
Eric