According to the pros, liquid eyeliners are surprisingly versatile and work for a variety of makeup looks. “I tend to use a liquid liner when I want a super-bold cat-eye or to draw smaller lash-like lines under the eyes,'' describes Lottie. Dreadon agrees, saying uses liquid liner for almost every makeup look she does. “Even if it’s so thin you can barely see it, a teeny little line will complete a look,” she encourages.