Think of what Du use a color highlighter for in textbooks oder word Suchen puzzles. Du are making something stand out apart from the rest of the words on the page. With makeup, Du are making something stand out from the rest of your face Von highlighting an area. I see this most commonly with cheekbones. This tends to bring the focus Mehr 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.
