Final answer:
To reshape a wide jaw, applying a darker foundation below the cheekbones along the jawline and blending into the neck creates the illusion of a slimmer jawline.
Step-by-step explanation:
To reshape facial features using makeup, one can apply a darker foundation below the cheekbones along the jawline and blend it into the neck. This technique is particularly useful for addressing the appearance of a wide jaw. Adding shadow to the areas that are meant to recede, creates the illusion of a slimmer jawline. It is important to blend well to ensure a natural transition between the darker foundation and the skin tone, avoiding harsh lines.