Serge, but what you do not like the version with Bulgakov?
Olga Ludwigovna made many portraits of Moscow Art Theater. Known portraits Kachalova, St. George's, Hyacinth. But there is a portrait of the writer Leonid Leonov.
(True, he was the first husband of her daughter Catherine Dmitreevny.)
Kardovsky, by the way, then lived in Moscow. Lunacharsky Dmitry N. allocated to the school-studio space. Seems Prechistenke somewhere, you have to look, to clarify.
(only recently looked at the materials Kardovsky and his Moscow studio.) I would have stuck to my version. What's wrong? : shy: Better than "Portrait of an unknown in the cap. : D
So let someone proves that it is not Bulgakov on the portrait at the window looking at Moscow and M. and M. " invents. .