I would put all my stuff like all my cloth,shoes, the room would looks like a store.

I would put all my painting. and the room wall would be painting also i would have a studio. 

I would have a piano,guitar, and also the light will be mixing with a lot of color.

and the room would have a big picture of mine lol and my room would had a lot of art and painting stuff.

because i like and also it's would have a notebook and they book because i like read and write my own stuff.