Miniature of Ekaterina Alexseevna Uvarova (1783-1849). 1817. Collection of the State Historical Museum, Moscow. In the public domain in the United States because the artist has been dead over 70 years. via
Miniature of Maria Feodorovna, wife of Tsar Paul I. 1821. Gouche and watercolor. Pavlosk Museum collection. In the public domain due to age. via http://mariafedorovna.blogspot.com/2015/05/
Bedroom in the second reserved apartment of the Winter Palace, bedroom of the future tsar Alexander III from approximately 1852 till 1866 when he married and moved.1874. Russian. Watercolor. Edward Petrovich Gau, artist(1807-1887). In the public domain due to age. via http://winterpalaceresearch.blogspot.com/2016/07/
“House church.” from the album “Views of the Church, Residential and Residence of Grand Duke Sergei and Grand Duchess Ella, Moscow.” 1905. Watercolor. Ignatius Nivinsky, artist. Collection of the State Historical Museum, Moscow. Fair use license. via https://hitrovka.livejournal.com/133918.html