Thank you very much for posting the original. I agree with some of the other comments, while the generated faces look highly photo-realistic, in some cases they also look quite different from the actual person.

Not that different mind you, but humans are obviously super sensitive to tiny changes on faces - it doesn't take that much to make it look like a different person altogether. For the non-face images it was much harder for me to really detect many differences, and they certainly didn't bother me.

Thank you for this link. The differences between the original and the upscaled SR3 model are highlighted mostly for me on the picture of the leopard. The facial markings are clearly different.