Sketch for The Lion Hunt is a Rococo, Oil on Canvas Painting created by Peter Paul Rubens from 1614 to 1615. It lives at the National Gallery, London in London. The image is in the Public Domain, and tagged Lions, Hunt, Horses, and Grisaille. Source
A grisaille sketch is a monochrome painting, often used as a sketch in preparation for a finished work. In this grisaille, Rubens prepared for The Lion Hunt — he would reuse the central group — the rider pulled from his horse.