What technique involves diminishing a feature while highlighting another to create depth?

The technique that involves diminishing a feature while highlighting another to create depth is shadowing and contouring. This method uses darker shades to create shadows in areas where you want to appear less prominent, such as the sides of the nose or under the cheekbones, while lighter shades are applied to accentuate areas you wish to highlight, like the cheekbones, bridge of the nose, or forehead. This contrast effectively enhances the three-dimensionality of the face and can dramatically change its appearance.

In essence, shadowing diminishes the visibility of certain features, creating an illusion of depth, while contouring helps to enhance desirable features. This dynamic interplay allows for a more sculpted and defined look, which is a foundational principle in makeup artistry.