#1 and #3 are my favourites, I love the way #3 is positioned, framed, and the overall action feel to the shot.
#2 needs more space at the top of the pic, I'd almost be inclined to crop it with more space at the top and slightly less below.
#4 doesn't do anything for me, I don't like the position of the bird almost looking away, nor the crop, to me it doesn't suit the shape of the bird in the frame.