I stumbled across this piece when doing on-line searches for Georgiana. The auction site is: here.
It is a beautiful painting of Georgiana, done after her death, but based on the 1787 original from Thomas Gainsborough.
“Ferdinand van Stoopendaal (Swedish, b. 1850), “Georgiana, Duchess of Devonshire”, oil on canvas, after the 1787 original by Thomas Gainsborough (English, 1727-1788), 16 in. x 20 in., framed”
A wonderful tribute to Lady Georgiana Spencer, ancestor to Princess Diana. Lady Georgiana Spencer later became the Duchess of Devonshire.
Georgiana Circle: Women Healing History 
Sorry. I don’t know any great idea about where to sell art. Just interested in the Georgiana news. -KW
My parents have too painting from Ferdinad Van Sttopendaal and we are looking to sell them.
Any advice?
Miguel