Head of a sphinx in profile

WORKSHOP OF PETER PAUL RUBENS (SIEGEN 1577-1640 ANTWERP) Head of a sphinx in profile black chalk, heightened with white, on light brown paper 18 ¾ x 15 in. (47.6 x 38.1 cm.) (2)together with a copy attributed to the circle of Peter Paul Rubens, Head of sphinx in profile, red chalk (ii) 20 x 14 5⁄8 in. (50.6 x 37.3 cm.)