Which aspect of a hairstyle is primarily determined by face shape?

The aspect of a hairstyle that is primarily determined by face shape is the haircut style. Face shape plays a crucial role in determining which haircut will complement a person's features most effectively. Different face shapes, such as oval, round, square, heart, or long, have distinct characteristics that can be highlighted or softened through specific cutting techniques and styles. For instance, a round face might be complemented by a hairstyle that adds height and elongation, while a square face may look better with soft layers to round off the jawline.

In contrast, color choice, product used, and styling technique are more about personal preference, fashion trends, and hair texture rather than being directly influenced by face shape. While these aspects can enhance a haircut, they do not fundamentally change how the haircut itself should be designed to harmonize with the person’s facial structure.