The U.S. Dorothea Lange "Migrant Mother" stamp (Sc.3185m) reminds me to post this group from Palau.
Issued January 2 2014 celebrating the modern art of photography, there are two honoring Lange by showing photos taken during the Great Depression (Sc. 1192a and 1192b), as well as one by Lewis Hine (Sc.1192c).
The three on a mini-sheet with prominent selvage showing Lange's 1936 photo. The photo is most often just called "migrant mother," but it was of Florence Owens Thompson (1903 - 1983) and two of her children daughters Katherine McIntosh (on the left) and Norma Rydlewski (in Thompson's arms). The children were still alive when Sc. 3185m was issued which makes the stamp something of an exception in U.S. postal history.
There is substantial back-story to the photo, as the New York Times
noted in this 2018 article.