Marie Louise Petit at the Age of 105, with Her Young Nurse. Dated: 1765. Dimensions: sheet: 29.4 ? 30.3 cm (11 9/16 ? 11 15/16 in.) mount: 40.2 ? 31.3 cm (15 13/16 ? 12 5/16 in.). Medium: watercolor over black and red chalk, heightened with white cha