The Head of the Virgin in Three-Quarter View Facing Right, 1510?1513, Black chalk, charcoal, and red chalk, with some traces of white chalk (? ) ; some remains of framing outline in pen and brown ink at upper right (not by Leonardo), Sheet: 8 x 6 1/8 in. (20. 3 x 15. 6 cm), Drawings, Leonardo da Vinci (Italian, Vinci 1452?1519 Amboise), The verso of this sheet is inscribed with a gray-brown ink '. T. ' that is quite reminiscent of the 'Melzi-Leoni' markings on Leonardo?s drawings and manuscripts. The study for the head of the Virgin on the recto has sometimes been doubted by scholars 'ex silentio' as being by Leonardo, possibly because its magical beauty renders it suspicious (Walter Vitzthum in 1966 quoted a recent English critic?s opinion in his support, 'the drawing makes one think of Walter Pater?s mind rather than of Leonardo?s hand')