Nell Brinkley (September 5, 1886-October 21, 1944) was an American illustrator, comic artist, and creator of the immensely popular character the Brinkley Girl.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Nell_Brinkley

Cover for the Sunday Dayton Journal by Nell Brinkley / July 26, 1936
FROM https://www.dbdowd.com/illustration-history/2015/11/13/nell-brinkley

Nell Brinkley on Artnet: http://www.artnet.com/artists/nell-brinkley/

Further reading:
https://cartoons.osu.edu/digital_albums/nellbrinkley/index.php
http://www.edwardianpromenade.com/women/fascinating-women-nell-brinkley/
https://womeninillustration.tumblr.com/post/128707577398/nell-brinkley