I like the raised hood. These birds are tough to expose properly; as Alan pointed out the blacks are a little blocked. It also looks like you've done some processing on the whites of the breast to get them under control (they look a little gray). Sharpness could be better; for that kind of pose f/5.6 should give you plenty of DOF and a shutter speed of 1/640. The extra shutter speed would probably have done the trick for you.
I just paid a visit to our local zoo today and saw my first Hoodie of the season; always a treat!