Contrary to many people, I really like pigeons! Anyway, on my monitor they all look a tad out of focus. I know the experts all talk about the rule of thirds when composing a shot, but remember that rules are made to be broken and that said, the rule of thirds is not written in stone and it appears with the two shots of the single birds that you were trying to keep them out of the center of the shot. In my opinion they would have looked better if they were more centered; especially the second shot where the bird is almost out of the frame.