The halo effect refers to what cosmetic feature?

The halo effect specifically relates to a cosmetic feature characterized by the 360-degree natural white marking around the lips, often referred to as the "halo" surrounding the mouth. This feature is important in cosmetics and aesthetics because it draws attention to the lips, enhancing their appearance and creating a visual contrast that can make the lips appear fuller and more defined.

The concept of the halo effect extends beyond just the physical appearance to the psychological impact it has on how beauty is perceived; it suggests that a single attractive feature can positively influence the perception of other attributes. In the context of cosmetic application, achieving this effect around the lips can be a significant aspect of creating a more appealing facial aesthetic.

The other options involve desirable traits that can contribute to overall beauty, but do not specifically capture the essence of the halo effect as described in this context. Even skin tone, bright eyes, and defined cheekbones are all positive features; however, they do not embody the unique attribute and technique associated with the 360-degree white marking around the lips.