Rona Berg knows that sometimes women have dry skin. Or tired eyes. Or limp hair. Or a pimple. And as a beauty expert, she knows exactly what to do about it. Drawing on years of covering the beauty industry, working behind the scenes at fashion shows, fixing actresses' and models' beauty meltdowns, and learning insider information from hundreds of consultants and make-up artists, Ms. Berg--author of "Beauty: The New Basics," with 122,000 copies in...