I am in the same predicament and tend to think that it looks more calming to go with variations of complimentary same colors throughout. One of the same color might appear too boring. I would suggest a warm pale green/gray with the burgundy/red couch and then maybe do varying shades of the greens and grays everywhere. I may be doing barren plain, stone harbor, dove wing, white dove in my main areas, but my dining room might be a warm pink and I may do the ceiling in the palest of my grays.

My DH is European as well, and loves yellow, as do I. So we agreed to put a nice yellow in the kitchen and gold in our living room and have enjoyed it, but it's only been a couple of years and I'm ready to change it. Why? because it's hard to relax in. I did cool soothing colors upstairs and find them so much easier to live in. If you already have green in the kitchen why not try something complimentary from the cooler side of the color wheel like a soft blue for your walls and bring the yellow in through accessories?

Since you already used BM paint check out Vellum, Barley, Chestertown Buff, or Concord Ivory for your LR.

For your den Tate Olive (darker next to Louisburg Green). If you go red try Ellen Kennon's Berry Red. Amazing red!If you cant do that then BM Raspberry Truffle is a good red. If you use red in the den just be sure you carry the red to the other rooms as accents.

I would go for a lighter version of the LR yellow in the kitchen. Like one or two up on the same strip. Or get the paint mixed at 50% lighter.

Just some suggestions. I am not a paint expert. I have a few paint dramas of my own going on. LOL.

Thanks, kyjo! I may do that red in the powder room off the den. I'm leaning more in the greens for the den, so I will definitely check out Tate Olive, along with those colors you suggested for the LR.