In the painting First Steps, after Millet, by artist Vincent van Gogh, what are the artist's techniques in terms of media or style?

Van Gogh's
painting First Steps was completed while Van Gogh was in the asylum
voluntarily in Remy, France, in the fall of 1889-1890.  Since he was unable to go out through
the countryside and paint as he customarily did, Van Gogh used prints, reproductions and
photographs as...

href="https://www.metmuseum.org/toah/works-of-art/64.165.2/" title="First Steps,
after Millet, 1890. Vincent van Gogh (Dutch 1853-1890). Oil on Canvas. the Metropolitan Museum
of Art">