You need to think slightly differently when you plan a room box because it has its space limit, its given breadth and depth and height. And you need to decorate the walls, floor and ceiling before you can put anything in.
I started by painting the ceiling with an ordinary indoors decoration paint, and I put in floors cut from a placemat. For wallpaper I used a paper napkin.
picture frames with lolly sticks and grill sticks. I made a sofa just like the one I have in my house, but it had to be smaller to fit into the room box. So scale is deceptive. I made a side table from a chess piece, sconces from paper clips and pen caps, a fruit bowl from a plastic medicine card and fruit from clay. The champagne bottle is a candle, and the cake is made from a plastic bottle cap. I cut the rug from an old shirt. I also made a fan palm and a marble pedestal to put it on, behind the sofa. The stupid thing is that the final picture I took before I gave away the room was hopelessly blurred.