Gladys Nilsson (born May 6, 1940) is a contemporary American artist known for watercolors and collages.
Biography on National Gallery of Art:
https://www.nga.gov/features/exhibitions/outliers-and-american-vanguard-artist-biographies/gladys-nilsson.html

Pink Suit #2 by Gladys Nilsson
1966 / Watercolor, over graphite on paper / 16-1/10″x10-1/10″ / Art Institute of Chicago, IL

Gladys Nilsson on Artnet: http://www.artnet.com/artists/gladys-nilsson/

Further reading:
https://www.interviewmagazine.com/art/gladys-nilsson-retrospective-honk-matthew-marks-garth-greenan-hairy-who
https://www.frieze.com/article/gladys-nilsson-older-i-get-bigger-i-want-these-women-be
https://interactive.wttw.com/art-design-chicago/hairy-who

Slava Raškaj (January 2, 1877-March 29, 1906) was a Croatian watercolorist.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Slava_Ra%C5%A1kaj

Yellow Cock and White Hen / 1899 / Watercolor
Moderna Galerija, Zagreb, Croatia

Water Lilies I / 1899 / Watercolor
Moderna Galerija, Zagreb, Croatia

Partage Plus online visual database: http://partage.muo.hr/?object=list&find=Slava+Ra%C5%A1kaj
Further reading:
http://hirc.botanic.hr/vrt/english/new/Slava_raskaj.htm
https://www.pragmaprojects.com/deafhistory/index.php/component/zoo/item/slava-raskaj
https://awarewomenartists.com/en/artiste/slava-raskaj/