My thoughts - as the photo is part of the Hessen Staatsarchiv, the room was probably in Bialowieza when GD Ernst visited Poland c1903. Skierniewice’s décor was classical from period of GD Konstantin Pavlovich 1820s and Spala had a simpler hunting lodge interior.
The wainscoting is similar to Nicholas’ rooms in Bialowieza when Tsarevich. Another clue to the time frame is the painting of Alexandra. Nicholas loved it and most likely had it replicated to hang in Bialowieza similar to Franz Kruger’s paintings of AI and NI that were distributed to various palaces, etc. The furniture style feels “hunting lodge”.
It would be fantastic to see the photo albums belonging to the Imperial Family for the year 1903.
Joanna