What I like: the eyelashes help show the angle at which you are looking at the eye, the eyelid is expressed by simple lines that draw your attention to the rest of the eye, the shine on the eye looks realistic.
What needs improvement: the pupil isn't center from what I'm seeing, the reflection isn't clear, the style (anime or realistic) isn't clear, and the lower eyelid looks saggy because of the illinear placement over the eyeball.
Overall: honestly, It's a good piece. It has amazing line work, the shading is perfect where it is, and you provide a good contrast on a large amount of stuff. the problem is that where the flaws are make the piece seem alot worse than it actually is. But don't let that discourage because You're really close to a photo-realistic eye. Good job on the piece and keep up the good work!