On 1 April 1851, Monet entered Le Havre secondary school of the arts. Locals knew him well for his charcoal caricatures, which he would sell for ten to twenty francs. Monet also undertook his first drawing lessons from Jacques-François Ochard, a former student of Jacques-Louis David. On the beaches of Normandy around 1856 he met fellow artist Eugène Boudin, who became his mentor and taught him to use oil paints. Boudin taught Monet "en plein air" (outdoor) techniques for painting. Both were influenced by Johan Barthold Jongkind.