Artnet’s listing of summer museum exhibitions includes Richard Diebenkorn at the Harwood Museum of Art, Taos, NM; “The Unknown Monet: Pastels and Drawings” at the Sterling and Francine Clark Art Institute in Williamstown, MA; and “The Mirror and the Mask: Portraiture in the Age of Picasso” at the Kimbell Art Museum, Fort Worth, TXRead more.