First accent walls need to connect to something in the space so like a rug color or even a color from a piece of art. You do not just grab a color and slap on a wall. This is my kitchen the orange wall choice came from the stool color.. IMO in your spce you need some color in the other things in the space not just a random color on a wall.

What a lovely space. I might be inclined to leave the living room one color and let fireplace be your feature wall to enhance decor there. Now the dining room walls could be the room to change wall color in a complimentary wow color to draw into that space. Good luck hope you’ll post updates!

I don't think you need an accent wall at all. Some rooms just don't lend themselves to it. But the wall color currently is close to the color of the sofa which makes the room look blah. A lighter or darker color would look better. Different art behind the sofa and some throw pillows would help. Use the colors you're sampling on the accent wall since those must be colors you like.

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Your choice of a color can successfully come from anywhere -- including your own imagination (not everyonés got one!). It can be a contrast or a compliment or a match or a shocking departure ..... But the real issue here is that you had the nerve to do something different, and now that the experiment is done you are being honest about the result --- big deal, it's paint -- but what's next?

I think you need to go back to what gave you the impulse to color a wall, You say you wanted more life in the room. Why do you think the room lacks life?

Can't answer for you but when I've felt a room looked dead it has been, at varying times:

The seating wasn't arranged to invite relaxed conversaton.

There were not enough delightful personal items in the room, things that I cared about.

There were not enough interesting patterned things in the room to move the eye around to look at

There were not enough lamps or they were too small to make an impression

The wall colors were too shallow and flat.

I think you are right that the green wall you now have blocks in the room rather than enlivens it and it doesn't flow. It emphasizes that the wall is short. I can't tell without being in the room if a different wall would carrry more drama or interest, or what kind of color would be a hit.

If you re-analyze the room and continue to suspect your dissastifaction is being surrounded by all neutral mainly blank walls, try another experiment: Invest in some peel-and stick wallpaper, and try it out in different places. Another experiment is to bring different colored clothes into the room and toss them around like pillows and see if any jump out at you as a color to run with in the room, not necessarily with paint, but with decor -- pillows, curtains, artworks, tabletop ....

Since the fireplace is the focal point of the room, having that as the accent wall would probably work best. There are many different ways to do accent walls. You could paint, use wood or shiplap, and wallpaper. Below are some ideas for you for your space:

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