This is good, I can tell you took your time and were careful to make it very detailed, but to be honest at the end of the day, it's an eye, and there's only so much you can observe or comment on about a picture of an eye, unless its particularly exceptional. I look forward to seeing how you go with a head/face or full body figure, I know if can be challenging but make sure to keep yourself challenged and you'll keep improving. Thanks for sharing, keep it up!