Think of what wewe use a color highlighter for in textbooks au word tafuta puzzles. wewe are making something stand out apart from the rest of the words on the page. With makeup, wewe are making something stand out from the rest of your face kwa highlighting an area. I see this most commonly with cheekbones. This tends to bring the focus zaidi to the center of the face and give it sort of a 3D look. Highlighters as a rule tend to look shimmery on most people's faces.