superb detail throughout Andrea - you seem to have got good enough light to work the magic of freezing the movement, getting enough DOF and all the detail. It makes me want to go and start on our locals, except I am not sure they have survived the winter, haven't seen any about for a few months on their regular hovering slopes.
I like your own web-site too - always a nice image on the page and easy to get around without needless things moving and oozing about
Great details on the HD version. Never got a bird of prey image that good myself.
Maybe I would let more space under the bird, and/or try to suggest what the falcon was looking at. But I don't know if you have this info on the original frame though.