Pull your hair back and compare your forehead width to your jaw. If your forehead is noticeably wider and your chin tapers to a point, you have a heart-shaped face. A widow's peak is a common additional indicator.
The goal is balancing the wider upper face with the narrow chin. Add volume at the jaw, minimize width at the forehead.
Bottom-heavy frames draw attention to the lower face, balancing the wider upper half. Avoid styles with heavy upper rims.
Bottom-heavy and round frames balance the wider upper face. Avoid cat-eye and top-heavy styles.