Georgia O'Keeffe was one of the world's most influential female artists - in 2014, her painting "Jimson Weed" sold for the highest price ever paid for a work by a woman. Famous for her vivid oil paintings of flowers, landscapes and animal skulls, she lived and worked in the wild dry canyons and deserts of New Mexico in the southern United States. Lucy Burns speaks to her former assistant Agapita Judy Lopez.

PHOTO: Georgia O'Keeffe's "Cow skull" on display at the Art Institute of Chicago in 2014 (Getty Images)