Nice sharpness and underwing detail. Exposure is quite good, although I might have pushed another third to the right. I would have like the bird flying towards you; as presented it's ever so slightly past you. And I would remove the hint of green at the bottom of the frame below the tail feathers.
You have captured some good detail from the underwings Dave, and overall nice and sharp too. I like the placement of the heron in the frame, and I can see the green mark LRC.