like them all but as you asked
#1 My fav of the bunch nice framing nice positioning, excellent sharpness and clarity
#2 nice framing and positioning again, but lacks contact with the viewer, try adding a catchlight and bringing up the levels a bit, also im not sure but the beak may be the point of focus
not the eye, looking at the hi res image will let you know .
#3 had the potential to be a great shot, the biggest problem for me is that the grass is in focus and the zebra is not, shame it would have been the best of them.
#4 as has been said the background is a little distracting, have you tried an adjustment layer and darken it down a bit, other wise nice placement within the frame and ncie sharpness.