For 10 points, name this final painting of Jean-Antoine Watteau, named for its use as an advertisement for the title art dealer.
Two women in this painting are wearing an older style narrow-waist gown with stays, one with a fontange and the other with a steinkerkque, while two others are wearing the more fashionable sack-back gowns. A box with a set of brushes sits to the right where a woman displays a small painting to two gentlemen, one of whom looks bored, resting his cheek in his right hand, and to a woman in dress of pink and blue vertical stripes who leans her elbow on the counter on this work's right side. The contrast in newer and older fashions is highlighted by the removal of a Pierre Mignard portrait of Louis XIV on this painting's left side. On the right of this work, a man and woman with their backs turned to the audience examine a large ovular painting depicting a number of nudes, while on the right, two men pack a pair of paintings into a box. For 10 points, name this final painting of Jean-Antoine Watteau, named for its use as an advertisement for the title art dealer. 
Two women in this painting are wearing an older style narrow-waist gown with stays, one with a fontange and the other with a steinkerkque, while two others are wearing the more fashionable sack-back gowns.
The Shop Sign of Gersaint [or L'Enseigne de Gersaint or The Store Sign of the Art Dealer Gersaint or Gersaint's Signboard; accept any logical equivalent that includes the words "Sign" and "Gersaint"]