Top left: 1838 Marie Luise Augusta Katharina Königin von Preußen Kaiserin von Deutschland by Carl Joseph Begas (Klassik Stiftung Weimar - Weimar, Thüringen, Germany). From Wikimedia 799X960 @72 175kj.
Top right: Unknown woman by Franz Xaver Winterhalter (location ?). From adini-nikolaevna.tumblr.com/post/173721666475/portrait-of-an-unknown-woman-by-franz-xaver; expanded to fit screen 1258X1304 @72 535kj.
Bottom left: 1850s Élégante par Adélaïde Salles-Wagner (location ?). From melodymistblogspotcom-mistyclouds.blogspot.com/2012/09/young-woman-with-lace-shawl-by-adelaide.html 856X1220 @72 513kj.
Bottom right: 1858 Daughter and granddaughter of Mr. Agüero Vélez by Luis Brochetón y Muguruza (Museo de Arte Moderno y Contemporáneo de Santander y Cantabria - Santander, Cantabria, Spain). From tumblr.com/blog/view/history-of-fashion 760X1024 @72 311kj