I like the pose, soft light, good detail, and the gradual slope of the grass. The bird feels a little tight in the frame on the right, bottom, and left.
I agree wit the aforesaid and I would also have a look at the bill, maybe Curves or Shadows Highlights to reduce the highlights would enhance the detail a little further.
Good pose from this fella, its different to see one on the ground rather than perched. Perfect HA, and good details especially on the wing plumage. I agree the comp need more breathing room though.