I think the colors currently on the walls work fine. I might suggest however that you remove all the small understated wall and sparsely spaced pieces replacing larger more intentional ones for impact. If you opt to keep the art and pictures on the walls they need to come down to eye level height. Rather than painting entire walls you could paint the transitional walls like a bridge (the one by the stairs and the one by the front door). You could go with a latte, coral, grey, or gold. Good luck.

My advice would be to go on Houzz and start some idea books to figure what your style is . Right now all you will get is dozens of ideas that will keep you more confused than ever. We need info to help with this.

Leave the wall with the fireplace on. No one wants to see into your kitchen if it is at a time, you just made a meal, and havent had time to clean up yet. I would leave the wall between the dining room, and nook,kitchen too, for the very same reason. I have a dining room open to my kitchen, and no good way to close it up. I hate it. If I have people for dinner, then anyone sitting on one side of the table, has a direct view to my kitchen sink. Not exactly what you want to look at when you are having a nice meal.

Do you like branches' type? smth like this one? https://www.lightology.com/index.php?module=prod_detail&prod_id=771002 or this one which is less ornate https://www.lightology.com/index.php?module=prod_detail&prod_id=771028 they're gilded though..might be too much with chrome..chairs' legs are chrome, right? a bit hard to see.. this one is smaller but will have presence due to whimsiness and color https://straydogdesigns.com/collections/chandeliers/products/olive-chandelier one can go for several pendants in cool texture. https://www.etsy.com/listing/159724618/modern-pendant-light-custom-lighting?ref=shop_home_active_8&frs=1 way too expensive (as if other's weren't)), but I like te idea of customising every finish https://www.alliedmaker.com/collections/products/products/arc-pendant-perforated-20?variant=33462204873 these are cool but no idea where one gets them. to be frank. http://dmoch.se/news.html if you prefer industrial..one can order almost any length. I'm not sure where the light goes in this one though.. https://www.schoolhouse.com/collections/pendants-chandeliers/products/regent-chandelier-white many great links I had don't seem to work for me anymore(( but give us a direction maybe. Because I have a lot more that still work, and might be completely missing the point. whatever you have (is it Darlana?) looks good too I must say. I can see why you'd want a change, but still. great improvement on these shelves, congrats!