Size:

Just because a living room mirror is large, that doesn't mean it is one size fits all -- in fact, large mirrors can start at 35 inches tall and go up to 80 inches. The size of the large mirror you pick will vary greatly depending on the layout of your room, the height of your ceilings, and the gap you have set aside for your mirror. Whichever mirror you go for, Nicole Hollis recommends leaving at least five inches between the top of your mirror and the ceiling, and the same for the bottom. This small gap will help create the illusion of more space and prevent a closed-in look.

Style: 

As your large mirror is for your living room, you must ensure it will fit in with any existing décor or a new décor scheme. Jessica Davis states that a large mirror can say a lot about your style and help create an ambiance. For example, a gilded gold mirror will suggest elegance and an old-money vibe, whereas a bright white or smooth gray mirror will appear more modern. If you have an antique living room but choose a clean-lined mirror, it will immediately look out of place and make your living room appear un-cohesive. Darker furniture tends to look better with bronze or gold detailing, whereas lighter wood and white pieces pair best with silver and nickel finishes.

Shape and Maintenance: 

If the shape of your large mirror is geometric, it will create an ultra-modern look and interesting focal point in your living room. Meanwhile, a straightforward rectangular mirror may not be as visually interesting but can add an extra dimension to a clean-lined room. Another important factor to consider when buying a large living room mirror is how it will attach to your wall. Some mirrors attach via hooks that need to be drilled into the wall and aren't suited to rented properties, whereas others have adhesive backing that could damage your wall. As for maintenance, if your mirror is made from metal that tarnishes like gold, you'll need to undertake regular maintenance to stop it from getting overly rusty. You can do this with specialist metal cleaners even few months and regular dry polishing weekly.

Proportions:

A large living room mirror in a classic sideways rectangular shape won't appear as large as a mirror that extends up to the ceiling. However, per Courtney McLeod, you can use this to your advantage. If you have low or sloped ceilings, a rectangular or square mirror will take up room in width but not necessarily height, meaning it's the better choice. If you have high ceilings and a narrow room, a rectangular mirror facing upward or a tall oval mirror will emphasize the positive room proportions you do have. Plus, a mirror can often make a space look bigger due to its reflecting light qualities - just make sure not to make the mistake of picking a mirror that overwhelms your wall, as this will make any room appear smaller.