Nice typical harrier gliding/hunting pose. I like the dangling talons and the blue BG. I'm suspecting a big crop from the subject distance you indicate and from the IQ of the bird. It is properly focused but just not having the fine detail due to that large crop. I also find its placement in the frame quite high due to the large amount of empty space below...if you are into that type of image editing you could raise the grass line closer to the harrier and then crop as a pano. Just an option for you.