Wonderful texturing–that peeling wallpaper looks amazing!
Great colour choice builds the atmosphere, but there is some else I'm trying to wrap my head around. You achieved a sort of a wavy effect of the corridor. I don't know if this is becasue of different pillar shapes, different shading on the floor and few irregularities of the angles or something else, and I don't know with how much intention, but, when you look a bit longer at one point, the walls starts to move to the center to crush you
A bit late but thank you for your kind comments Stickman, Mr_Hk, SeDiceBisonte :)