Stuart, Very nice head on pose. I like the perch also. I think it looks a bit tight in the frame and the feathers seem a tiny bit too saturated to me. The details look very good :)
Stuart, in addition to Axel and Denise's comments which I agree on, I see quite a bit of evidence of clean up on the right side (as viewed) and some sort of blothchiness in the lower left corner and around the perch. I would also get your signature out of dead center as it's a distraction to the subject. Otherwise, the outstreched wings and eye contact are nice.