I think part of the point of this thread was about that when I saw the picture in question, I just thought back to all the times, I kicked myself for doing the same thing when I started out. And even 40 years later I can look at a portrait I did in a controlled setting and going, shit, why didn't I fix that piece of hair, or why didn't fix the clasp on the necklace or why didn't I move one person slightly to the left.
And the point is, number one, learning to see that stuff when we are nervous in front of our subjects, and taking the time to see the other elements, and secondly to have the confidence to take it slow, and getting away from the feeling we are imposing on their time.
So the "what would?????do, is to sort of a mindset to pretend we are them at the time of shooting(Ansel HCB, Karsh or whomever), and just taking our time, like they would (in most circumstances). But I guarantee every photographer who ever lived, has looked at any picture he ever took and said, damn, I wish I'd fixed this or that or printed it slightly differently.
One of the most useful things I learned in the many many workshops I've taken over the years is not necessarily the technical stuff, it was actually the ability to watch how the teachers/instructors worked with the subjects and the environment. I've probably taken at least 30 different seminars/workshops all by professionals, and it was eye opening. How they talked, engaged the subjects, let them know it was collaborative, how they set up, how they approached a blank canvas and laid down the elements.