Mrozovskaya's subjects included Nikolai Rimsky-Korsakov, Mathilde Kschessinska, Vera Komissarzhevskaya, and other artists, writers, and actors of the time. Her photos of the interior of the Saint Petersburg Conservatory, taken beginning in 1896, are among the earliest recordings of the conservatory, and in 1897 she was named its official photographer. She won a bronze medal at the General Art and Industrial Exposition of Stockholm (1897) and a silver medal at the Exposition Universelle (1900) in Paris, and participated as well in the Liège International (1905).