This is presumably the third of the trio of Madrazo y Kunz portraits of Isabel II wearing her blue dress with silvered lace. Woops! I mean quartet.
Keywords: Madrazo y Kunz, Isabel II, Queen, Borbon family, Spanish, straight coiffure, tiara, veil, lace, off shoulder vee neckline, modesty piece, bertha, quarter length close sleeves, vee waistline, full skirt, flounces, order sash, earrings, brooch, bracelets, gloves, regalia