Focus on A Couple (Les Fiancés) and explain the Background.
Renoir and Alfred Sisley (1839–1899) both attended the studio of Charles Gleyre in the early 1860s.  By 1865, they were good friends. Renoir painted Sisley's portrait several times, beginning with Mother Anthony's Tavern (1866). A letter from Renoir to artist Frédéric Bazille (1841–1870) in September 1869 identifies the woman at Sisley's side as Renoir's model Lise Tréhot (1848–1922). In the letter to Bazille, Renoir writes about his desperation for money: "I exhibited [the portraits of] Lise and Sisley at Carpentier's. I am going to try to stick him for about 100 francs, and I'm going to put my woman in white up for auction. I'll sell it for whatever price it goes for; it's all the same to me."
Lise Tréhot Frédéric Bazille Mother Anthony's Tavern Charles Gleyre Alfred Sisley