I like the angle, perch, BG and eye contact. I might have stopped down a bit more to have the feet in focus, too. The eye area looks a bit oversharpened on my monitor.
I like it, esp. the off-centered COMP. A bit darker with the mid-tones and a bit more contrast might improve it.
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Aidan, I like your image - all comes together nicely - beautiful bird, perch, background and catchlight in the eye. More DOF would have been great, but I see you were already at 1/160 at ISO 640, so your f5.6 selection is justified.