What is the most important reason not to lift the client's skin during makeup application?

The most important reason not to lift the client's skin during makeup application is that it can change the look of the makeup once you let go of the skin. When the skin is pulled or stretched, it alters the natural contours and textures, leading to an unintended and sometimes dramatic difference in appearance once the skin is released. This can create an unrealistic finish that does not hold up in the way intended, as the makeup will settle less favorably in its natural position. Maintaining the skin's natural state ensures that the makeup looks cohesive and flattering from all angles.

In contrast, while lifting the skin may appear to help during application, it does not provide a true representation of how the makeup will look in a relaxed state. The goal of applying makeup is to enhance natural beauty, and working with the skin in its natural position supports that objective.