Final answer:
For a low forehead, use lighter makeup to create the illusion of space; for a protruding forehead, use darker makeup to visually recede the area. The art of makeup, as described by Ovid, lies in the subtle enhancement of features.
Step-by-step explanation:
When it comes to makeup techniques for different forehead shapes, the goal is to create a balanced appearance. For a low forehead, one might consider keeping the hairline clear and using lighter shades of foundation or highlighter along the forehead to create the illusion of more space. When dealing with a protruding forehead, contouring with a bronzer or a darker shade of foundation along the hairline and temples can help to visually recede the area. The key is to blend well to avoid obvious makeup lines. Understanding these techniques can be seen as an art, much like Ovid describes, where the strategic application of cosmetics can enhance one's natural features without seeming deceitful or excessive.