Seen! Kestrel on the tower of the castle ....

A few days ago around the  Montalbano Mountain (for ornithological surveys) I began to scrutinize steeples, towers and roofs of old farmhouses, and ruins in search of blue rock thrush but I haven't found it; attracted by the white droppings on the walls of a castle's tower, I found a nest of kestrels; it was up there almost hidden by the color of the mimetic plumage, stood out in contrast to the stones, without binoculars I wouldn't have been able to see it .... painted later by some photos I tried to visualize the scene in different angle of view.