Going for soft whites and beiges, even a grey, that has a warmer undertone, rather than a cool undertone, is the key to keeping it cosy. Think toasted tones like Granola, Salt of the Earth, and Crème de la Crème. Avoid stark whites, which will take away from the warm and calming environment.
When choosing furniture, consider beautiful antique pine to add texture to the room. Steer clear of pine with an orange-toned varnish and stick with natural pine, which has a clear wax on it, letting the natural patina show through.
Alternatively, you could try a dark, rich wood, something like cherry wood, to help keep things clean and elegant, but also add depth. It could be a chest of drawers, or a coffee table, an accent chair, or even the base of a lamp. These touches add layers and cosiness and enhance without overcrowding.