Pierre-Auguste Renoir, 1880-81. Friends lunching on a Seine restaurant terrace. Phillips Collection, Washington.
From Wikipedia
Luncheon of the Boating Party is an 1880–1881 painting by French impressionist Pierre-Auguste Renoir. Exhibited at the Seventh Impressionist Exhibition in 1882, it was identified as the best painting in the show by three critics. It was purchased from the artist by the dealer-patron Paul Durand-Ruel and bought in 1923 from his son by industrialist Duncan Phillips, who spent a decade in pursuit of the work. It is now in The Phillips Collection in Washington, D.C. It shows a richness of form, a fluidity of brush stroke, and a flickering light.