What term describes the outline or contour of the face when viewed from one side?

The term that describes the outline or contour of the face when viewed from one side is "profile." A profile provides a side view of the face, capturing its features and overall shape at that angle. This perspective is essential in hair design because understanding a client's profile helps stylists create hairstyles that complement and enhance the natural contours of the face. For example, certain hairstyles can accentuate or soften specific features, such as the forehead, nose, or chin, based on the profile's characteristics.

The other terms, while relevant to overall aesthetics and design, do not specifically refer to the side view of the face. Proportion refers to the balance and relationship between different elements in a design, rhythm pertains to the flow and movement within a hairstyle, and shaping is the process of creating the desired form or structure in hair. Understanding these distinctions is crucial for effective hair design and client consultations.