Mocked up your living room and here's a layout that I think would work well for your room. Not sure if you're sectional is flexible so you could switch the longer bit to the opposite side or if you're planning to get a new couch. I've placed the TV on the wall opposite the windows. You could also add a couple of ottomans that can be moved around and also act as a coffee table. You can add some storage/ bookshelf to the wall where you have currently placed your TV. I've added a console by the window that can be replace with any storage you like.
Let me know if this works for you. Will work on more layouts soon.
Q