Looks like pretty wonderul, rich light to me. ISO??? Shutter speed? Love the soft light, the sharpness (esp. the pupil), and the open bill. COMP is perfect too. The whole image is a bit dark overall and, in addition, would benefit from a gentle curve to increase the contrast a bit.
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I think bringing up the darkness a bit as Artie suggested will bring out more detail at the top of the head..........besides that you have captured a very beautiful bird,
Roman