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The Lost Generation: Hemingway and the circle of ex-pat friends he later incorporated in The Sun Also Rises. Top photo includes, Harold Loeb, the model for Robert Cohn in The Sun Also Rises, on the left, and Hemingway in the center.
In the bottom photo: Hemingway on the left, Harold Loeb, Lady Duff Twysden, Hadley, Don Stewart and Pat Guthrie.
Writing the book, Hemingway thought of himself as the Jake Barnes character, Lady Duff Twysden was Brett, Pat Guthrie was Mike Cambell, and as mentioned, Harold Loeb was Robert Cohn.