I believe the correct answer is: “Las Meninas” by Diego Velázquez.
John Singer Sargent's technique of applying paint in thin
layers was influenced by the “Las Meninas”, a painting by Diego Velázquez, the
leading artist of the Spanish Golden Age. Sargent painted a small-scale copy of
the painting “Las Meninas”, after which he painted a homage to the painting in
his “The Daughters of Edward Darley Boit”.
True, or they will tell history of their time so we would know what it was like on their times.