2. Use Lip Liner
Highlighting your lips is a great way to make them appear fuller, but you have to do it correctly. Begin by choosing a liner that is one shade darker than the lipstick you are using. Then draw around the outline of both lips.
Next, use a highlighter to outline your upper lip only and pay special attention to the groove that runs from the top of your lip to your nose. White liner applied just to the notch along your upper lip can go a long way to making your mouth look fuller.