“Winter Garden of Empress Alexandra Fyodorovna.” 1860’s. Konstantin Andreyevich Ukhtomsky,(1818-1881). Collection of the Hermitage Museum, Saint Petersburg. via https://www.arthermitage.org/Konstantin-Andreyevich-Ukhtomsky/Interiors-of-the-Winter-Palace-The-Winter-Garden-of-Empress-Alexandra-Fyodorovna.html.
“The Winter Garden” from the series “Interiors of the Small Hermitage.” 1865. Edward Hau, watercolorist (1807-1888). Collection of the Hermitage Museum. via https://commons.wikimedia.org/wiki/File:Hau._Interiors_of_the_Small_Hermitage._The_Winter_Garden._1865.jpg.
“The Interior of the Palm House on the Pfaueninsel near Potsdam.” 1834. Carl Blechen (1798-1840). Collection of the Art Institute of Chicago. Cc Licence via 1.0. via https://commons.wikimedia.org/wiki/File:The_Interior_of_the_Palm_House_on_the_Pfaueninsel_near_Potsdam,_1834,_by_Carl_Blechen_-_Art_Institute_of_Chicago_-_DSC09556.JPG
Winter Garden, Yusupov Palace, Saint Petersburg. 1852. V.S.Sadovnikov, artist. via https://terijoki.spb.ru/old_dachi/od_articles.php?item=12.
Winter Garden of the Yusupov Palace, Saint Petersburg. 1862. A.A.Redkovsky, artist. via https://www.liveinternet.ru/users/4000579/post371616532.
All Russian art in the public domain because the artists have been dead over 100 years.