Boy with a Lute
Frans Hals
ca. 1625
The Fingernail Test is an oil-on-canvas Dutch Golden Age painting that has been attributed to either Frans Hals or Judith Leyster, painted in 1626 and now in the Metropolitan Museum of Art, New York City.
The Metropolitan Museum of Art, New York · Image: The Metropolitan Museum of Art, CC0 · Text: Wikipedia (adapted), CC BY-SA 4.0