Sectional must stay.

You’re asking about decor and accessories. Color scheme you have looks like it follows your inspo picture pretty well. What’s missing color wise is touches of lights / brights & also the feel of your room is more formal than the casual feel of inspo room. Easiest add for casual & relaxed is a few lighter color toss pillows - cream & color of your walls + a throw. These items would be best in textured finishes like pillows & throw on inspo pic sofa. Add art over the wall end of sectional. Adding drape panels would soften the window - they don’t need to close - panels only with panel rods over each end of window. The sectional would need be moved just a bit away from window to allow panels to hang cleanly.

I would add curtains, art, and a coffee table.

I would center sectional with TV as much as possible, moving from back wall. I would use sofa table with lamps and wall art above, plus extra chair and coffee table.

Thank you! The chair would be right where you enter the oom .... Would that work? The main entry way is on he wall of the window.

I think the sectional is too large.

I think the 2 examples celery provided and the one friday provided look great. I think if I had to pick, I would go with the first one from celery.