I know this will be controversial, but I tried enhancing the faces in this photo of passengers at the summit of Mt. McLcllan on the Argentine Central using Topaz Labs PhotoAI and its Recover Faces function. Some people were blurry due to their movement during the exposure, and the AI did some strange things with some of them while others had a surreal mix of sharp and blur, so I added back some blurring to some of those. I find that the enhanced photo gives a better sense of realism, but I'm keeping both and noting which has AI enhancements in the file name.
Original:

Face enhanced:

For a better comparison, here's a closer look at a few of them, with AI enhancements in the bottom view:
