1913 (post mark date) Prinz Ernst August, Prinzessin Viktoria Luise
From eBay; sepia tone removed by gogm.
This is another photo of Viktoria Luise wearing the same dress as in the last photo, presumably from a set.
Keywords: Viktoria Luise, Princess, Duchess, Hohenzollern family, Welf family, German, bouffant coiffure, under-bodice, high enclosing neckline, over-bodice, sweetheart neckline, elbow length flared sleeves, over hanging bodice, A-line skirt, earrings