I love the 4th and 6th ones best.
Not lovin' the 3rd one at all - too snapshotty, does look out of focus, doesn't grab you in any way, and the location of the child in the frame seems awkward (though I'm on my laptop and having to scroll to see the whole pic so that might have something to do with it) - maybe it'd have worked better if you got in tight.
I like the ducks on #1, but not sure I like the angle - maybe more on the diagonal would be nicer.
#2 I would've preferred the camera shifted to the right a bit (rule of thirds would've worked for this one - and that would've prevented his pinky from being cut off).