I love the clean, uncluttered look of your home and you've made some great furniture choices. My first thought, though, is that I would try to rework the sofa/sectional placement. It really is unwelcoming looking to me to have the back where it is facing a wall, when it could be oriented to look into the room and out the windows. It seems like if it were placed in the corner under the stairs that it would feel open and invite you to come in and sit. I'd hate to be cooking in the kitchen and have the family or guests with their backs to me. If you are having a TV in another room close by, do you need one in that room, too? If, so placing a 70" unit will probably only work as you have it. But, to me, it's not going to look like a living room but more like a movie theater, which is fine if that's what you're going for. It seems like it won't be a cozy conversation area, though. I might actually flip the rooms and put the dining room where you have the sofa now. I was looking at lights used with dining rooms and ghost chairs and saw this, maybe would work in the living room? Kind of fun. don't know if it would look as good without the colored walls though. And I thought something like these were interesting to consider for over your table:

We need to see more, and from different angles. I too would like to know what country you are in because that would influence decorating ideas as well. Also if you are renting, or if the is your own.

Lil, you're offering up thoughtful ideas in response to a very vague question that changes shape and just getting grouchy, rude replies. I think it's a troll. :)

Be careful not to go overboard using different neutrals. Some neutrals are warm toned, some are cool toned. You can combine warm and cool in a space but it is hard to pull off. If you aren’t confident in your decorating skills, pick one neutral tone and stick with it. Then add interest with accent colors. A good place to start is to find a properly sized fabulous rug with colors that work with your floors and walls. Then build the rest of your choices from the rug style and colors.