Sister Gertrude Morgan (April 7, 1900-July 8, 1980) was a self-taught African-American artist, musician, poet, and preacher.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Gertrude_Morgan

New Jerusalem by Sister Gertrude Morgan
N.D. / Acrylic and ink on pieced card / 6 3/4″x7 3/4″ / Private collection

Sister Gertrude Morgan on Artnet: http://www.artnet.com/artists/gertrude-sister-morgan/

Further reading:
https://americanart.si.edu/artist/sister-gertrude-morgan-3413
https://www.bridgeprojects.com/artists/sister-gertrude-morgan
https://www.nga.gov/features/exhibitions/outliers-and-american-vanguard-artist-biographies/sister-gertrude-morgan.html