You painted the walls with white paint and bought a bunch of beautiful new mirrors. However, your small space still seems so ... small.
Instead of accepting a defeat, consider this simple two-minute method as a solution: put your mirror in such a way that it stands directly opposite the window.
We all know that a large mirror does an incredible job when it comes to making the space more open. But, having it parallel to the window (as opposed to hanging near the window), it will imitate open views in its reflection.
Bonus: for small rooms, choose a mirror with a long silhouette, for example, a vertical and rectangular or high oval. These figures will create the illusion of height.