“Life class, summer school, National Academy of Design,” probably New York City area, ca. 1910 to ca. 1915, by Bain News Service, via Library of Congress Prints and Photographs Division on flickr.
The students are drawing or painting a boy left of center in the photo.
enclos*ure 
To able to hear the conversations and whispers . . .
I wish we could see more of their drawings and paintings.