Lots of beautiful blues…are there windows? From where does the natural light come?

For instance, East light would compliment B.M. Downpour Blue.

Thanks. Will post a few pictures tonight.

Lighting will make a huge difference but I would start with Benjamin Moore Van Deusen Blue HC-156. It's on the "moody" side so it won't feel too bright and jarring. Plus it's not do dark that it looks almost black.

Benjamin Moore Summer Nights is my favorite dark blue. It leans slightly green but it definitely is not teal. This room faces north and does not get much direct natural light due to nearby trees and a large hill.

Thanks All. Below are pictures of the room in all directions. The two windows are east facing and northeast facing. Plenty of light throughout most of the day. Our goal is to make it cozy and warm.

I like the color and style of your loveseat! You’ll definitely have to take that color into consideration when choosing a dark blue color for your walls. I’d pick a couple of different dark blue colors and order Samplize paint samples to try them out on your wall by your loveseat. Your first impression as to which dark blue is the most harmonious will be very helpful.

Personally, I would stay away from blue in a north and northeast facing room. And if you want cozy, blue isn't the coziest color--it can be cold. I had a beautiful slate blue damask wallpaper in my north/northeast facing dining room, and it was quite dreary. Even though I love blue, I didn't love the way it looked in there. I redecorated it and painted the walls and trim Linen White which is a very warm white, and used a floral patterned fabric with a green background for the window treatments. Trimmed them with red. The room really came alive and is much more warm and cozy.

BM Downpour Blue 2063-20 Use a paint base called Advanced Interior Satin finish. It resists scratches and gives you a very hard surface. Just color drenched a small home office in it using different sheen . Absolutely beautiful color especially if there's little or no natural light. Add wall sconces, chandelier in  gold with white globes and lamps.

Looks great with white and gray furniture