Of the first set, I like the framing of #3 the best, though the squawk not so much.
(The bittern looks focused in the other shots, but like he has an IQ of 1 when he squawks, lol.)
From a timing standpoint, though, it could be argued it's the best of the bunch.
I like the pose of the bittern in #2 the best, you really nailed it. It would be (IMO) a shoe-in for the pick, but unfortunately that stick in the background distracts and takes away from an otherwise perfect shot.
#1 is very clean, but it's cropped too tightly (looks like he's hunched in a box). It would probably show better not quite so tight.
(On all the shots, you crop too close to the tops of their heads, IMO.)
Those quibbles aside, it's a very nice series, and I know it is tough to get nature to "be perfect," so excellent job at getting close.