Excellent stuff Pius. I can't believe the amount of images you got on just two visits to the owls. Seems like you are sitting on a mountain of keepers.
As I commented on Flickr, #3 is special with the smaller in frame and mossy tree. Also liking #6 here.
As stunning as all the rest are, there's something about #3 that really grabs me. Which is strange because the bird sorta blends into the tree. That's just a fantastic composition. These are amazing and very inspiring. YGMV
Gary