Get rid of the bed to start with. Could be wrong but it looks like a really awkward shape for that room. And it looks more like a strange dissection table than a bed. Get something longer and much closer to the ground, traditional bed bed. You desperately need some kind of bookshelf or other type of shelving. Unit. Most of the stuff under you bed of course has to go somewhere else, storage closet or something. Put the new bed, and night stand, where the computer setup is right now. Nothing should be under the window. And the computer setup along the wall where your bed is currently but in the corner where the Ikea lamp is now. But the bookcase/shelves close to where your bed is right now. Repaint the whole room. The lighting you have over your computer looks kind of cool / quirky but it doesn't really work. I'd go with something more traditional.
Just a few ideas.