Furthermore, a buildup of dead skin cells may irritate sensitive skin during shaving. Get enough sleep. The time that you spend sleeping may make a huge difference in the appearance of your skin. When you are not sleeping for long enough, your skin will look dull and washed-out, and you will notice dark circles forming under your eyes. A lack of sleep can also lead to increased occurrences of embarrassing breakouts. You will feel well rested, and you will have better skin.