I shot this image in the bird's own habitat in Sapsucker Woods at the Cornell Ornithology Center. I cropped it on both the left and right, by about 20%. I didn't do any additional post-processing: it seemed pretty sharp to me and the exposure seemed adequate. But I am eager for your suggestions. In addition to post-processing suggestions, I'm also wondering if the background is too distracting, and if I should try to lighten the eye. (And if so, how?) Thanks!
Canon Xsi
300 f/4 with 1/4 extender, at 420 mm
ISO 200
f5.6, 1/320 s
tripod









