The left image is from rom antique-royals.tumblr.com/post/116136623938/isabelle-of-orleans-duchess-of-guise; the middle image is from antique-royals.tumblr.com/post/116136623938/isabelle-of-orleans-duchess-of-guise; and the right image is from antique-royals.tumblr.com/tagged/orleans. Spots were removed from all of the images with Photoshop and each had a monocolor tint that was removed. These photos were probably taken by the Danish photographer Sonne in a session with her cousin Marie who married Prince Waldemar of Denmark. They posed together.
Also posted to Isabelle d’Orléans, duchesse de Guise’s Subalbum here.