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Excellent job on these, Karl! and the fact that the images are taken through a window is an added value
Sharp detail is the leitmotif of this set. Detail are sharp, but could be a bit more clean in some of these, IMO. What I'm saying is don't be afraid to push a bit more the NR on the subject, especially on the eyes and the OOF areas. More so when you have sharp files like these.
Abut the DOF I'm a fan of shallow DOF, as long as the eye is in focus. As somebody said, DOF is the third dimension of a photograph. I know I'm in the minority, but, if you think about it, things that are around us, on our periphery, are out of focus. For this reason when we look at a shallow DOF is very pleasing to the eyes, because they look very familiar. It is how we perceive the world
Finally the bg. Bgs are not distracting, but are not very supportive either. I like how it works in #4 and #8 (not your #8, the eight pic). I know you did the best with what you got, but bg sometimes is what makes a good shot a great one
Glad you were able to use your 500mm to get yourself and the viewers closer to these little cute creatures. It makes a big difference