The left image was found on eBay, misidentified; the right image is from facesofthevictorianera.tumblr.com/post/72656771347/antiqueroyals-theresa-marchioness-of, sepia tone removed.
Theresa posed several times wearing this dress, changing jewelry a bit and carrying a fur-trimmed coat in for at least one shot.
Keywords: 1875, Theresa Vane-Tempest-Stewart, Marchioness of Londonderry, Marchioness, Talbot family, Vane-Tempest-Stewart family, curly coiffure, tiara, off shoulder vee neckline, bertha, cap sleeves, deep vee waistline, bustle, close skirt, rosettes, necklace, jeweled crucifix, brooch, clasps, bracelets, coat, fur