Putting a small or medium sized round mirror in your dining room can help enhance the formality of the room. It reflects your chandelier, illuminates the space, and gives it a more romantic feel.
In your living room, place the mirror opposite the windows to expand the space, make it brighter, and reflect the plush materials you already have. This makes the space feel much cozier. Your living room likely has the biggest walls in your house, so this is the perfect place to hang a large statement mirror.