Édouard Vuillard

The woman in the chair was a pianist who ran with a crowd of painters, writers and musicians. Apparently he painted her many times and the two stayed close friends for years, even after her marriage ended.

The woman reading is Madame Hessel — according to what I've read, she was his art dealer's wife and one of his closest friends, and he painted her over and over for something like forty years. This is her on holiday at a house by the Normandy coast.

According to the Met's own notes, that's not the only woman in this garden — a second one is hidden among the rosebushes at the front, put there on purpose to blend in.