Flaky, scaly lips reflect less light, meaning they will look smaller and duller. An easy, instant way to make your lips look a touch larger is to scrub your pout daily with your toothbrush. An added bonus? This boosts circulation, too, promoting a rosier hue sans makeup.
If you worry that your lips a tad too thin, avoid darker lips colors. Aside from being trickier to apply, deeper hues will flatten the appearance of your mouth, instead of making it look fuller.