A tour de force of pen and ink: Guercino’s St. Thomas at Mia N. Weiner, 36 E. 73rd St. On view through Sat.

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Leaping lion: a copy of a famous Rubens image at Dickinson Roundell, 19 E. 66th St.

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How Diebenkorn used gouache to find his voice: early color abstractions from '49 to 55 at

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Almost time for a drink at the end of a busy day ! by Thomas (1756-1827).

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Jan Toorop, "Portrait of Nina and Fritz Meyer-Fierz," 1909, shown by Mireille Mosler Ltd at 35 E. 67th St.

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Giuseppe Bernardino Bison, "The Holy Family," shown by Christopher Bishop Fine Art, 33 E. 68th St, 5th fl.

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