Canopy Desk I Need Help Decorating A Teen Room!?

I need help decorating a teen room!? - canopy desk

I have a room full moon, and I'm 13th My walls are white dotted blue light green, pink and yellow. I also have a white desk, white sofa, a chair, lime green and a canopy Polka Dot. I need tips for decorating! Please! I re-do part of it!