This is very good. With some simple changes, it could be very realistic. The bottom lashes are never longer than the top. The lashes themselves are a little too harsh of lines. The eyeshadow could be more blended. I don't see a waterline and the eyelashes look as if they come straight out of the eye (they don't). The iris and pupil are actually perfectly round so I'd use a template to draw it. The eyes have certain points that are supposed to be the highest and lowest. I would do a study of eyes just to improve upon my skills if I were you. I think you have the talents to learn from your mistakes if you can already do this.

Great picture.  Could you check out some of my work sometime?