i also like your picture. The light you had was really good and you show us this bird in his natural enviroment. I think to photograph these birds is not easy, so for me its unimprotant that some parts of the tail are nearly black and have no details.
You have to be happy to have such a great place for photographing these beautifull birds. Hopefully i have the time during this spring to go to the north and see some (may be also to photograph them)

best regards from southern sweden

Falco