This tutorial will show you how to draw perfect eyelashes the easy way.
First thing you do is make a brush in the shape of a triangle like the following .
Click on the triangle to see what it looks like zoomed in.

Make sure you draw the triangle with the pen tool with stroke off and fill on ()
To make the brush we drag the triangle shape to the brush palette, for more help on making brushes have a read of my making brushes tutorial.
When you drag the triangle to the brush palette, some options will come up so choose art brush, then make the following settings.

Now that the brush is made we can draw the eyelashes with the pen or pencil tool (your choice), like so:

Select all the lines and apply the triangle brush setting to it and it will change like the following:

Now you can change the stroke size if you want on each stroke so you make it look more realistic.



Here is an example of using the eyelash brush in one of my illustrations.