Follower of Jean-Jacques de BOISSIEU (Lyon 1736 - 1810) A pair of sheet of studies of faces and animals Sanguine, pen and black ink, black stone and black pencil. One bears a monogram at the bottom left. (Paper warped, folds, slightly unstained, a wetness on the upper edge of the first one). 20.5 x 27.7 cm each Our head studies are found in two engravings by de Boissieu (in the same direction as the engraving, with a different positioning) (see: M.F. Perez, L'Œuvre gravé de Jean-Jacques de Boissieu, Genève, cabinet des estampes, édition du Tricorne, 1994, p. 213, fig. 96 and p. 269, fig. 123, reproduced).