What is your style? you seem to have nicely framed art or photos on the wall, are you going for more contemporary? How many people will be using this room? If you can post a floor plan with all dimensions showing windows and entrance to the room that would be great.

Take advantage of the rail as space for a sectional, two trees and a floor lamp in the bay window, two swivel chairs, a large round ottoman, two side tables/lamps, and a bookshelf in the far corner. And a rug.

This idea

Willow Glen Charmer · More Info

A roll arm is comfortable for napping. A nice blue.

This is nice for behind the sectional

Swivel chairs

Does a painted accent wall work for the TV wall? Then just minimal decor is needed there. Maybe paint the room.

Your art gallery wall seems a little high...for behind furniture, it does not necessarily need to be at eye level...especially for art photos that can be enjoyed while seated. Clear the sofa by 4-6 inches.