Could you sketch a floor plan?

He needs a place to keep his clothes so you could buy a larger dresser like this one from Wayfair.

Is he going to entertain friends here too? If not, then the two sofas should go. Take a photo from in front of the window to the other side of the room, so we know the space we're dealing with. Comment here to load more pix.

Why not search the box above under teen boy's bedroom and let him start his own ideabook so we can see what he likes?

Agree with Deco. What does he like?

The T.V should be where it faces the sofa at the end of the bed since that is where he will spend a better part of his time playing games take away all the rest of the formal looking pieces and your treadmill add some bedding that he chooses along with a rug some decent lamps and then a large cork board somewhere for all the stuff they collect that needs a home get him involved in the process at that age they have very particular ideas of what they want in the space and for now forget about what you think should be the style because you will be wrong.

the more thought he puts in, the more he'll be invested in keeping it picked up. or we can hope, anyway.

Hey there! A colorful modern steamer trunk would be a playful, functional addition to this room. Ours come in lots of colors and sizes, are strong enough to use as spare seating, and have the option of adding wheels for easy transport. Bonus: It should easily last long enough for your son to bring to college when the time comes!

I'd take out the loveseat that is on the wall and put the TV there. Remove the living room type end tables and put something with storage at each side of the bed. Is there already a closet?

Also, consider removing the headboard of the bed. It looks like it takes up space. This is a boy. He doesn't care.