When you tightline your eyes, you put eyeliner on your upper waterline, which is the line inside your eyelashes. It makes your lash bed look bolder, which makes your eye shape stand out, and it makes your eyelashes look thicker.
For tightlining, you need a clean surface. Make sure your face and hands are clean before you start. Then, put a pea-sized amount of primer all over your lids. When you do this, your eyeliner and makeup will stay put and not fade during the day.
The next step is to curl your eyelashes. Be careful, and curl them up well so you can see better where your eyelashes and lids meet. Sitting in front of a mirror in a well-lit room will help you find your upper waterline.
When you use a pencil liner, make sure to sharpen it before you tightline. This will help you get a clear line with less smudging, and it also gets rid of any germs that might have been on the pencil.
If you want to use gel liner, you might want to think about using a flat or curved brush. Dip the brush into the filler pot and press the pigment on both sides of the brush to make the top more pointed and flat.
To draw a line along your waterline, hold up your lid with your fingers and make short, quick strokes. You can also try to do it all in one long stroke. If you're using a gel brush, rest it on its side and gently wiggle the tip into the upper waterline.
Repeat the above step on your lower lash line. Pull your lower lid gently downward to reveal the spaces between each of your lower lashes.
Use a flat or curved liner brush to apply powder or eyeshadow to the waterline. This will help your tightlining stay in place all day. This will set your gel liner and protect it for a long time.