Nice details and comp! Good alert pose. I'd likely eliminate the piece peeking in in LRC, and reduce the shine on the bill and far leg. Waht is the perch?
I agree about the piece in the LRC if it's within your ethics to do so...minor thing though. Is it OK to say I feel I could reach out and touch this bird as a critique? I don't say that often but that's how I feel about this image...so lifelike. ;)
Interesting perch, I also like eye contact and sharpness. Another vote for removing the sheen on legs and bill and if it were mine I might remove the stone in the lower right.