Vytanni's Guide to Simple Eyes
First you make a slanted line...
Then you add the top of the eye, just a simple curve like this.
Then the bottom, depending on the emotion this line will change a bit, but this is the simple version.
Then a curved line for the outside of the iris. This can change with the position you want it to be in, but the simplest is the side-eye.
Then you fill in the pupil.
And then you finish up with eyebrows, you can do lashes if you want... but I always leave them out because of my particular style.
And that sums up my quick tutorial of Eyes. If you need more info, don't hesitate to ask!