How to decorate a bedroom?

I get a new bedroom, a 10×13. I bought new bedding and plan on making the decor match the bedspread. My bedding is bright red, black, gray and white. I think I going to paint the walls gray and the trim black. I also have roses on the black sheet. What decorations should I put in the room? I have a black vase with red roses, a black shadow box with a rose, and a cute black bird and black feather. Any other ideas?
Also, everything has to be removable! So I can’t paint a rose on the wall or anything like that.

I have to hang Mirrors everywhere. they make the room look bigger when you hang mirrors on the wall. i would get some sleek Sophisticated furniture as well. (black)