Good sharpness. I'm not sure I'd go with a vertical crop here, as the bird feels a little tight in the frame. Is it my imagination or is the bird pointed slightly away from the viewer?
Might try a horizontal as I too feel it is a bit tight. You got great detail from a lens not noted for it's sharpness. Just goes to prove how important good fundamentals are to good photography.
Sharp, goofy looking young bird, but definitely needed to be a HORZ capture.
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