Face shape, hair curl (straight or wavy), hair texture and hair volume, are the important factors used to choose a hair style.
Oval face can allow you to choose any hair styles, but do not let your hair cover your cheekbones. If your face is round-shaped, you can try short hair styles, you can also have long hair styles, but avoid medium hair styles.
Rectangular shaped face can try short to medium length hair styles. As for a square face, you can have short wispy sideburns, or you can have soft tendrils. Curly hair is best suited for a square face. If your face is triangular-shaped, you should consider short hair styles or wedge hair styles, as they can help balance your jaw line.