Step 1:

    The basic shape of an eye is oval so start by drawing an oval shape like in sample 1.  Then position where the iris and pupil will go like in sample 2.

    Step 2:

    Now you’re ready to add the eyelids and eyelashes like in sample 3 and 4.

    Step 3:

    Once you’re happy with your drawing lightly erase all unwanted lines and then go over it again either with a sharp darker pencil or a fine line pen.

    Step 4:

    Now shade it in however you like.  For realistic effect don’t forget to make a small part near the pupil white like below.  You can achieve this by just using an eraser.