From eBay; spot in upper right corner removed with Photoshop and sepia tone removed by gogm.
This photo shows that Alexandra's dress has a rolled collar and a waist band.
Keywords: Princess Alexandra Viktoria, Prinzessin August Wilhelm von Prueßen, Prinzessin August Wilhelm Von Preussen, Alexandra Victoria of Schleswig-Holstein-Sonderburg-Glücksburg, Schleswig Holstein family, Hohenzollern family, Princess, German, straight coiffure, high neckline, collar, long close sleeves, waist band, natural waistline, tight skirt, necklace, earrings, bracelets