There are plenty of reasons to wear liquid eyeliner. It gives your makeup a sultry feel, makes your eyes really stand out and it doesn't smudge. Plus, you can use it to create a retro, winged look by drawing in a flick at the outer edge of your eye. That is of course, if you can apply it without making a mess. But don't worry, we put together this handy step-by-step video to show you how to apply liquid eyeliner with ease.