When you add a framed mirror to a dark space, it can be used to reflect light and brighten the room.
Here are a few ways you can use mirrors to make your space look its best:
Place a mirror facing a window on an opposite wall to pull light in from across the room during the day.
In a dining area, position the mirror at an appropriate height where it can beautifully reflect light from a chandelier or hanging light fixture, perhaps over a serving buffet.
If a room has lighter colored walls to make it seem brighter, try dark frames against the light wall to allow the mirror to make a dramatic decorative statement as it becomes an architectural element of sorts.
In a dark corner or small hallway, a mirror can give the illusion of more space.