This is the second painting in the Louvre-Lens series, after Louvre-Lens meditation. The painting this visitor is looking at is by Fragonard. The current title is "Figure of fantasy", but it used to be called "Diderot's portrait" (the French philosopher), which is now contested. You can see this painting in my post on the Paintings in the Louvre-Lens museum.
Is that Diderot? - Oil on canvas panel (6" x 8") by Benoit Philippe