For instance, a face seen in blue light illumination is totally different from one seen under red light illumination. These factors cause variations in face appearance. Major factors that influence facial aging include gravity, exposure to ultraviolet (UV) rays from the sun, maturity of soft tissues, bone re-structuring, and facial muscular activities.
This statement is true because facial appearance varies more dynamically as it is affected by several factors including pose, facial expression, head profile, illumination, aging, occlusion, mustache, beards, makeup (cosmetics), and hair style.
