This is Catherine Wendell, the 6th Countess of Carnarvon. She married the 6th Earl of Carnarvon, Henry George in 1922. They divorced in 1936.
For some reason, I find this painting to be hauntingly beautiful.
Maybe it is its tone-on-tone effects with just strategic pops of color.
Or the pretty woman.
No matter, just enjoy!
(If anyone knows, please tell me who the artist is.)