This shot of the three owls in the cleft of rock is pretty good. Perhaps crop it to a typical 4x6 format with space removed from the bottom. Then I'd start by stretching white/black points to increase contrast. And sharpen....Would appreciate your constructive criticism. Think about it this way - what would you change so that you would enjoy hanging them on your wall.
Some suggestions have already been made for the barn owl to enhance contrast and sharpen. In addition I'd crop the right side up close to the bird's tail.
I'd have to see the full frame of the long eared owl to recommend anything. The other two are pretty much documentary IMO.