Richard--I have seen a few of Carolus Duran works over the years and I agree with Sargent's assessment that he taught it well but didn't practice it with the great of abilities. On the other hand many of his time consider him the most popular portraitist on the continent in the 1860's-70s.
If one wishes to understand Duran's teaching, there is a half finished work (accepted as a Sargent student work) in the Des Moines Art Center which has been a delight to study when I am passing that way. It is a study of an old man, nude, half-length, leaning on a staff and life size. It is completely finished at the head a shoulders and gets progressively simpler as one moves down until at the last six to twelve inches of the work we are able to see the first two value block in. That is the separation of light and shadow.
The best Sargents to study are the small figures in his landscapes. They show an abbreviated but complete version of his portrait method in a very decipherable way. If you know how to study brushwork, then these are the best way to study his method.
I agree, alas, there will probably be no more insight into his working method from written sources than we already have. It's a shame. I still dream of a long lost film of the great master. Maybe someday.
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