Olga's Gallery
Sir Lawrence Alma-Tadema.
A Picture Gallery.
1874. Oil on canvas. Burnley Borough Council, Towneley Hall Art Gallery, UK. More. 
A Picture Gallery: the man in the center is a portrait of the art-dealer Gambart, who commissioned the picture. On the wall there are several historically documented Roman paintings, including Medea by Timomachus, which was bought by Julius Caesar