1) Small, clean white highlights, also called catch lights, in the same place in each eye add sparkle.
2)The upper portion of the eye (sclera, iris, pupil) are shaded by the lashes and eyelid.
3)The lower eyelid is drawn by sketching a fine white line between eyeball & lower lid. Then you leave a small space between the line and lashes. Practice different eye positions and emotions. You can copy these, google others, and even use real models, like family! Practice, practice, practice!