Colored eyeliner can be the only new element in your makeup routine. You can keep your usual base, brow shape, and lip color, then use the liner to change the feel of the look. The easiest place to begin is with a line shape you already enjoy. That way, you are trying a new shade without also learning an unfamiliar technique.
Keep the shape familiar for your first try
If you usually wear a short line along the outer half of your upper lashes, keep that placement. If a thin line across the upper lid feels comfortable, start there. A dramatic wing is an option, but it does not need to be part of your first attempt.
For a color experiment, browse Gucci Stylo Contour des Yeux Kohl Eyeliner Pencil in 04 Bordeaux or Gucci Stylo Contour des Yeux Eyeliner in 05 Amethyste. Review the product photographs rather than deciding from the shade names alone. Screens and lighting can change how a color appears, so leave room to adjust the width after seeing it on yourself.
Use line width to control how much color shows
A narrow line gives you a small area of color. Increasing its thickness makes the eyeliner a larger part of the overall look. Start thinner than your intended finish and build only where you want more visibility. It is easier to add a little than to correct a line that has become much broader than planned.
For general upper-lid application, work with small, light strokes on the external skin near the lash line, following the product's directions. Rest your elbow on a steady surface if that helps. Look forward with your eyes open between passes to judge what is visible in your normal expression.
Let the rest of your routine stay easy
Choose the eye look before adding optional shadow. You may find you like the liner by itself with your usual mascara. If you want shadow, a familiar shade applied lightly can keep the number of new decisions small. There is no need to buy a coordinated palette for a single eyeliner.
Use the cheek and lip products you already reach for, then assess the whole face. If the look feels busier than you wanted, reduce one element on your next try. Matching your eyeliner to your clothes, eyes, or lipstick is a creative choice, not a requirement.
Keep a black option for familiar days
Gucci Stylo Contour des Yeux Kohl Eyeliner Pencil in 01 Black offers a familiar shade choice for the same kind of upper-lid placement. Alternating a black line with a colored line on different days can help you notice which looks you enjoy without changing the rest of your routine.
If you want to compare shades fairly, try them with similar lighting and a similar line width. A thick line on one day and a barely visible line on another tell you as much about placement as they do about color.
Change one detail next time
After your first try, choose just one adjustment: a slightly longer outer section, a thinner line, or a different shade. Small experiments make your preferences easier to recognize. The goal is a look you feel comfortable repeating, with as much or as little color as you want.