Unfinished Study of Lioness and Cubs, from the North-West Door of the Duomo of Florence

Watercolor on off-white wove paper

Colored marker on paper

Charcoal, white pencil, white chalk, black ink, red watercolor (or ink) on off-white wove paper

Gouache and graphite on white wove paper

Colored crayon on paper

Unmounted drawing: color on paper

Colored marker on paper

Ink and watercolor with graphite color notations on paper

Watercolor, black ink and graphite on cream laid paper

Transparent and opaque watercolor on antique laid paper

Black marker, blue ink, paper, and adhesive on paper

Graphite on buff wove paper, mounted to buff cardboard