Looking good! On the first one, I would have tried to not cut off the bird on the right. And on the last two, did you crop these? It looks to me like to crop may have taken away too much of the image in terms of IQ. Also, if you wanted to get those birds wings in focus, you need a much, much faster shutter speed than 1/500s.
Definitely see an improvement in your shots since you started posting!