The Getty’s “Rococo to Revolution: 18th-Century French Drawings from Los Angeles Collections” displays high points of the museum’s drawing collection alongside loans from private collectors. The surprise is how well the loans stand up. There are  privately owned drawings by Watteau (a counterproof of one of the first drawings the Getty bought, in 1982), Boucher, Fragonard, Greuze, and David. There are also sheets by artists lately rediscovered by scholars and collectors. On loan are an impressive Gabriel de Saint-Aubin and a famous François-André Vincent. His trois crayons Bust-Length Study of a Young Woman (1780) was one of the first drawings to be reproduced as a color engraving. In case you missed the memo, Vincent was David’s archrival, husband to Adélaïde Labille-Guiard. The Getty also has an important Vincent drawing, The Secret.