Jack Delano/FSA: Mrs. Leroy Dunn chopping cotton in a field. White Plains (vicinity), Georgia. May 1941.

The photo reminds me a lot of some of Charles White's depictions of African American women. I can't prove that Delano knew him, but I do know that Delano visited Chicago's South Side Community Art Center more than once when White taught & exhibited there.
Charles White, Exodus I.

White had a very sophisticated understanding of racial representation. In 1941, he wrote: "I find, in tracing the course of the portrayal of the Negro subject in art, a plague of distortions stereotyped and superficial caricatures of 'uncles,' 'mamies,' and 'pickaninnies...."

"These conscious attempts to dissociate the Negro's real position from the total life of America, to disparage his contributions to that life, and to place him in an inferior category are harmful to the eventual realization of the Negro as an integral part of American culture."

White was determined to fight this situation. In 1940, he said: "Paint is the only weapon I have with which to fight what I resent. If I could write I would write about it. If I could talk I would talk about it. Since I paint, I must paint about it."

Gordon Parks became one of White's close friends, in the early '40s, & learned a lot from him & the other Black artists & intellectuals at the South Side Community Art Center in Chicago. It's no accident that Parks called his first memoir A Choice of Weapons.