a hinged full length mirror from IKEA (Stave mirror - that is x hides jewelry storage -- brilliant idea from The Girl on the Go! I would use a thin sheet of plywood cut to fit behind the mirror so I don't put so many holes in the wall.
I love this room because the bed is on the floor on a cool bedframe, and look at how the shoes are shelves for decoration! Even the book shelf on the radiator is handy. Use your window as a projector screen.