Paint is derived from your soft furnishings. No, I would not use multiple colors. I see nothing wrong with the flooring.

You can not select a paint color online, nor can anyone here advise with no idea your seating, rugs or anything else: )

Agree, one paint color is best. No need to highlight the ‘closet box’ with its own color. You’ll be surprised how much easier picking paint becomes when you’ve chosen furniture, rugs etc. textiles will go a long way in softening, warming, and defining this space. Lots of people feel like they should paint before moving in, but unless you’ve got a fully developed design plan guiding you, it’s easy to go wrong and end up painting yet again.

Wall color IMO is chosen with all your "stuff" in mind. The closet box needs to be not highlighted for sure. If you get enought light there maybe a nice real plant. Accent walls are best . if you must , added after all other elemnets are in place .The floors are pretty neutral and once rugs are in they will be just fine.I prefer all one color for open spaces with no real division between them. If that stained glass piece has to stay my first thought would be choose a color from it for the walls maybe not so intense but pick one.

I agree with the pros, this doesn't look like a good space for any color blocking. But you can certainly do something different in the bedroom and bathroom, and I can understand wanting to change the yellow. I like yellow, but I am not feeling that yellow. :-) Think of the fireplace as your accent wall. SW Alabaster and BM White Dove are popular warm whites. If you don't like the idea of a warm white, look at colors that lean green. Whatever you choose, make sure it is going to look good with the stone (is it stone?) on the fireplace. If you are not planning on changing the flooring or kitchen cabinets you will need to keep the color warm. Be sure to sample any paint colors you are considering. Large amounts of a color look very different than tiny paint chips. If you do decide to lean green, keep the green subtle. Large amounts of an assertive green would be just as overwhelming as the yellow.

Maybe the floor could be refinished to tone down the orange, but if the kitchen isn't going to change, I would wait on that. You're right, rugs will help. I think once you put rugs and furniture in there it will be a nice space. Maybe some roman shades on the windows too.

I would do just one color, and choose it depending on what kind of furniture you have, definitely not yellow. In case you have some pictures of you furniture you could get some suggestions here but definitely go and choose in person and bring swatches home to see what it would look like.

I also would only do one color, and take that color from your furnishings. I also agree that yellow has to go, not because its not a pretty yellow, but, because, yellow is one of the worst colors it could have been painted, with the color of cabinets and floors. A white with a tint of blue, or a tint of green, would look great with your cabinets and floors.

Your room is about as warm as it can get already with the floors and yellow walls. I too agree with Bev about white like the ones she shows. They will look really nice with your cabinets, floors, and accent color around the fireplace. Think of your furniture and rugs as all the color blocking you need. Painting the alcove and closet aren't great ideas, because they aren't features I'd want to call attention to.

I think you can do some color blocking after your know where the furnishings are being placed and after you select artwork for your walls.

If you post photos of your furniture and rug, we can get a sense of your style and offer different mood boards for you to ponder.

I agree no more yellow, but on my screen the yellow shown, for a yellow, leans “cool”, like lemon meringue or a greenish undertone or fainting highlighter- yellow, instead of a rich creamy yellow or one with orange undertones leaning toward tan. So I think that makes it more jarring.

You have all been so helpful. Thanks you. The yellow on the photos is definitely softer than reality. It's very yellow. Wonderful ideas.

Here’s a mood board using your stained glass for inspiration. Feather Gray is from Benjamin Moore.

More possibilities . . .

(Would need a floor plan for actual furniture arrangement.)