In terms of looks , there is a variety of mirror styles perfect for your bathroom. The classic vertical square is the most popular, and also the most practical. It fits most bathroom fixtures and gives a sense of familiarity to an unfamiliar technology . The key is matching the mirror to your sink. If you have a narrow sink,you want a more narrow mirror. Although this rule isn't fixed. The longer style horizontal rectangle would be perfect for a minimal style bathroom. By adding the large horizontal as a feature piece, it gives your bathroom character while steering away from the overcrowded look you've been trying to avoid.