Well, in adulthood, I think you are right that Tatiana was the prettier of the two. But both had much the same looks, and with one dying so young, it is rather hard to tell. Tatiana's looks were less ''mannish'' and more elegant than those of Irina, at least as the two got older. There is a certain look of beauty that you see in Tatiana's later photos that you never see in those of Irina.