Cardboard Room

I created illusion of depth by making it all zigzag thing by removing the top layer of the cardboard. I cut the little humps in half and like brushed it to one side so it was a darker shade, it's suppose to be a dark room. I raised the left and right sides of the hallway to make it seem more like walls but it didn't quite work. It's suppose to be a
dark hall way with a shadow coming out of the open door