Here's one time you may need to use powder: Finish and set makeup by lightly dusting loose powder with a large, fat cosmetic brush before you put on mascara and brow liner. Not too heavily, of course, but just enough to keep your foundation, blush and eye shadow in place. There are many varieties of sheer, translucent finishing powders and some are hydrating -- an added benefit for dry skin. You won't have to guess about these features; manufacturers tout them on product packaging and labels. Yes, there are high definition-quality finishing powders, too! These types are ultra fine powders designed to give you a picture perfect complexion.