Alma Thomas
(1891 - 1978)
 

Alma Woodsey Thomas was an African-American artist and art teacher who lived and worked in Washington, D.C., and is now recognized as a major American painter of the 20th century. She is the first African-American woman to be included in the White House's permanent art collection. Thomas is best known for the "exuberant", colorful, abstract paintings that she created after she retired from a 35-year career teaching art at Washington's Shaw Junior High School.

https://en.wikipedia.org/wiki/Alma_Thomas

Spring Fantasy
1964
transparent watercolor with brush and blue and black inks on wove paper 
75.8 × 56.2 cm
National Gallery of Art
https://www.nga.gov/artworks/179992-spring-fantasy