Ruth Ray (November 8, 1919-December 18, 1977) was an American commercial artist, portraitist, and Magical Realist painter.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Ruth_Ray

The Portal by Ruth Ray
1945 / Oil on canvas / 17-1/8″x12-1/8″ / Private collection

Ruth Ray on Artnet: http://www.artnet.com/artists/ruth-ray/

Further reading:
Scroll down for a bio~ https://www.artsy.net/artwork/ruth-ray-venus-de-milo
https://www.worthpoint.com/worthopedia/ruth-ray-vintage-arabian-horse-print-77152417
http://www.ruthrayartist.com/ruthslife.htm