Really can't see the sofa color but might suggest you paint the walls gray that has a green undertone. Then do your pops with pillows, throws, accessories. Get sample pots of the gray and large white poster board. Paint 12-15" square in the center of each board with the different grays. Move them around your space for 24 hours to see how they look in the light and with the sofa. Once you paint, post new photos here by commenting and using the AI button. We can advise better then if you'll photo with good light.

Sofa appears to be "olive". If you snap a photo from another angle (with your back to the window) we might be able to help a bit more.

Sometimes we can get caught up in the color name of the paint....I suggest think of your sofa as a suit of clothing and what blouse, shirt or sweater color you might wear with it...then accessorize and jewelry. Perhaps a very pale blue with olive. A better photo would be helpful since the lighting isn't true in think.