Jo Hopper was an excellent watercolor artist. Her palette was always filled with light colors, red, lime, green, or lemon yellow, that captured and expressed her “cheery” worldview. All her letters were signed the same, no matter her frustration, happiness, or disquiet, as “Cheerly, Jo.”
Her work was a prominent example of American modernism. Jo Hopper’s impressionistic landscapes fascinated the art critics, even if it was her husband’s work that caused a sensation. The Brooklyn Museum started to buy Edward Hopper’s works, beginning with Mansard Roof in 1923. Soon, Josephine Hopper found herself in the role of her husband’s manager, talking for him in interviews and keeping track of his sales. During their marriage, she never stopped painting but never got paired with Man Ray or Picasso again.