Paint the walls white
It’s a well-known fact that white makes everything look bigger. Going color-free adds a sense of cleanliness and openness to any room.
As interior designer Bruce Bierman told Architectural Digest, “White paint scatters light uniformly in all directions, which is why it covers the wall more efficiently than any other color. But of course, some whites can be very sharp, so you want to look out for this. If I were doing a loft with a skylight, or another space with a lot of natural light, I wouldn’t choose a stark white because it would be too glaring.”