I really didn't think inspecting that painting would cause that, what's behind that door with the black particles coming out? fun game, I like the inspect mechanic.
Are you question from the door on the first floor or the second floor? On the first floor you can find out by advancing through the levels of this build.
the door on the first floor, it also had like a wood chopping sound when I got close. I couldn't get any further, I probably missed what I needed to go forward,