Nothing, the tv is huge and distracting, try moving it to another wall and sitting it on a credenza, then the walls can be decorated as of now anything else added will look like clutter

Thank you all for your votes and comments. @Pallas, it depends on the space one have, and how many books/ items you want to display at once. Some people prefer to have just one shelf mounted on wall so it doesn't take up much space and some prefer a bookcase which allows for more items to be displayed at once and it's easy to move around if needed. We just wanted to find out which option people find more attractive.

I’ve got those in my garage and I think they could be upcycled. They did arrive in about 20 million pieces that in the end we had to get help to assemble them! I can’t remember what they cost. You may be able to get reasonably attractive ones from Ikea, as arc3d has shown, or maybe places like Dunelm and The Range, if they are still open online?

Looking at the birds eye view photo (how lovely to have that balcony!!) I would put the TV in one of the alcoves to the left or right of the fireplace, sofa facing the fireplace and TV, and coffee table between sofa and fireplace. Induction heater can then nestle in front of the sofa at the end where you sit. Little side table likewise can go to the side of the sofa at the end where you sit. You have two floor lamps, do you need both? I would keep one and put it near the record cabinet. Perhaps the dartboard could go on the wall above the fireplace? However I guess this layout may block a walkway or door or have some other fatal flaw...