Might change room into office, craft/creativity room

The room I'm thinking about changing into an office slash creativity/craft room used to be my bedroom.
This is at my parents house: I'm not allowed to paint the room or even put up nails. My parents rules :(
I'm thinking of turning it into an office because the perfect amount of light goes into this room so I'm more productive. I don't know the exact dimensions of the room as I don't have a tape measure with me right now. I drew a picture of it on paint (not exactly accurate) and took some photos. The room is just carpet. and I've been trying to find sites for inspiration and what not. room is kind of a mess right now lol.

Any ideas what I should do????





entrance from the hallway


kinda overhead


furthest corner



thanks so much! hope the photos dont' kill your computer :/