Facial shape is primarily determined by what factor?

The primary factor that determines facial shape is the position and prominence of the facial bones. The structure of the skull and the configuration of these underlying bones create the overall outline and contour of the face. This includes features such as the cheekbones, jawline, and forehead, which all contribute significantly to how a person's face is perceived.

Other factors, while they can influence the appearance of the face, do not fundamentally change its shape. For instance, hairline shape may enhance or soften specific features but does not dictate the actual structure. Skin texture can affect how the face looks but again doesn’t change the underlying bone structure. Eye placement can influence facial symmetry and expressiveness, but the overall shape of the face remains rooted in the bone structure. Thus, the prominence and arrangement of these bones are crucial in defining the unique shape of an individual's face.