Yes, yes, I know, there are a HUUUGE pale of tips and tricks for eyeliners but I still want to share some information with you.

People are asymmetrical, there are no two ideal identical parts.
But the asymmetry is so light that we almost cannot see it though. Girls might notice that eyeliner is usually drawn great on one eye but we cannot repeat the same on the other eye.

There are many things to create perfect eyeliner. There are even stencils for this!
In fact we just want to draw this things ourselves doesn't matter what you use: gel eyeliner, pencil, marker, even some shadows or anything else.
I will describe only 3 basic and easiest styles for eyeliner.

The first and simplest eyeliner (for beginners mostly) is a top lashline.
You can draw any line, it shouldn't be perfect, your hands may shake if you like, cause we will smudge it anyway! At first line your top underlash line! This will help to get a better look at the end.
And then just draw a line with your pencil (preferred in this case) on your top lash line and heavily smudge it with the tool or cotton swab.
Intermediate users can continue their eyeliners with smudged wraparound. Its kind of smoky eyes. All you have to do is draw top and bottom lines around your eyes and smudge that things out. A bit more difficult than the previous eyeliner but still simple. Its better to use small amount of product at a time cause its easier to add than to remove.
The next one! Winged tip! One of the most attractive eyeliner in my opinion. I will tell how I draw it.
I like to use wet angled brush and Crave eyeshadow color from Naked Basics.
.First of all I draw an angled line at the corner of my eye. It should begin from the very corner and look straight to the end of your eyebrow. Don't do this if you have totally asymmetrical eyebrow. Please.