I'm afraid with that green on the wall and your " hint of green" in your carpet you may be in for more green than you want! The only way you can make this work into two rooms is to add a separation between them! A line down the middle of the wall doesn't cut it! Adding a bump out from the soffit to the half wall could work if you really wanted to but why not just continue the color the whole way across the wall!

Keep the blue but make it a bit lighter or darker for the dining room if you must have a color change, but I think just continuing the blue will be lovely for you and then you can use the area rug in either room.

Please refrain from Mint on the walls; it is just too mint.

Unfortunately, the house does not get a lot of light, so, while we love the pop of blue, it would truly be too darkening if all over. Also, the carpet installed and is a little darker than expected with no green. Majority ruled and green is "out!" We're now looking at BM Sandy Shores 948 or Sparkling Wine 949, perhaps? Other suggestions? Need a foyer color as well. The kitchen and dining room are recently painted and as you can see, vinyl "wood" is being installed. Help me make decisions so I can get my house back in order, please, oh, please.

I would go with a shade of white, to bring in more light and neutrality.

Of the two I think Sandy Shores may be fine but it is very hard to discern color on a screen from afar! I would suggest however that you run the same color across the top portion of your dining space into the adjoining room as you do not have a natural break here! You can leave the bottom portion under the trim blue and then carry som blue into art in the top if you like after. As I said before, drawing a line down the wall is not a good look! I would use the same light cream color throughout this space.

Pic

Honestly for the best look and impact those two rooms just really need to be the same
wall color - there is just not enough separation between them to have two colors. I'd recommend either bringing the same color into DR or choosing new color for
both. Either of the colors you have suggested is just going to chop everything up and won't look right.

Have a look at the one above and below Mt St Anne in pic, both nice

Here are some ideas.

I live cocoa butter!

I LOVE (not live) Cocoa Butter