Private World of the Last Tsar: In the Note and Photographs of General Count Alexander Grabbe
by Paul & Beatrice Grabbe
Royal Russia: The Private Albums of the Russian Imperial Family
by Carol Townend
Romanovs: Love, Power & Tragedy
by Alexander Bokhanov, Vladimir Oustimenko, Zinadia Pereguova, & Lyubov Tyutunnik
I am only repeating recommendations by older members. ;-)