You have plenty of neutrals, so it looks like the rug will provide your color choices....a simple way is to find the dominant color in the rug that is not a neutral and use it in 30 percent of the room, then select the next less dominant color from the rug and add that color to your room.....say curtains, pillows, lamp shades of lamp bases, throws on the chiairs as in a pair over the back of each chair, or one throw on the sofa, accessory pieces in the book shelf area, be it flowers, frames or mats in frames, object d' art, etc. If you want to do curtains, then a solid or geometric print will work nicely. Another thought is to paint the dining room in a variation of your accent color and reupholster your chairs in a fun fabric that works with your paint, add curtains the same as the living area, and then just add pillows and flowers in the main living room as accents with the dining room carrying a completely different color for the whole area.....then the kitchen and the living room would have small areas of color that both relate to the dining room. Finally just add all white to both rooms to lighten it up and keep the colors of black, brown, and charcoal in strong contrast to the white to add drama to the room. neutrals with very slight addition of color in artwork but everything else white grey black charcoal addition of one color in curtains, chairs, pillows, walls......you already have chairs in charcoal, etc., but could add pillows in living room, curtains in dining room in pattern and white in living room, and pale paint in dining room and one wall of kitchen. I think you have a one note room, and it needs some jolts of color in all three areas; easiest to choose one and do all variations of it around the room, or two colors from rug, one dominant and the second one less so. Love your room

Have you looked at Article? do you like this combo? I just recently got the black leather Sven sofa and that exact chair for my room. I love them! I also got the Sven leather bench/coffee table. prices are very reasonable. Then find the accessories. bring in some art or a rug w/color. I really loved the sven in the blue. this would look great w/your floor and cream wall color. (it is cream, right, and not the yellow in the picture?) Here's how the Sven sofa, bench/chair look: The pouf was from Amazon,,,the Tables and MCM credenza I've had and refinished myself. Rug I had, but I want to get something lighter. If you don't like the mcm style, they do have some others look at the Sven Birch Ivory Sofa. it's on sale! https://www.article.com I don't know know what your style is, but here's a sample mockup for the nook...I like the idea of the bench against the wall diff pendant. table ideas, and a darker chair

Unless you have some special situation that we don't know about, the basics are that you need a table and chairs in the dining area. How many people do you want to seat? Do you need more storage in that room too? Benches are not as comfortable as chairs, and don't fit well in the room with your windows and baseboard heating units. Are there children or adults only? For the living room, a sofa and 2 chairs would fit well. How many people do you want to seat at one time? 2 chairs are better than a love seat, comfort-wise. It looks like the side near the front door is open - what does it open to? Will there be a TV in this room? That will make a big difference in furniture arrangement since there seems to be only one wall it can go on. When you send us the room dimensions with door and window openings we can give you an idea of sizes.

I like the art, but not over the mantel and sticking up above the built-ins. Have you tried flipping the two pieces of art? The table left of the kitchen entrance will be too small for the larger art, but you could find another spot for it. Then put the rectangular piece above the mantel to repeat the shape of the glass windows in the top of the built-in. The warm yellow/gold/brass tones in the two pieces should work well as your bling in the room. Try a low brass bowl on the coffee table.