Hey, nice eye! Great shading
Perhaps another thing that might improve it, would be to add a bit of thickness to the lids, and/or the skin around the eyes. Having a quick look at my eyes
there's kinda a ridge where the top lashes attach, where the eyelid goes from curvy to ... more inwards. For the bottom lashes, there's a bit of skin between the lashes and the actual eye (whereas the bottom lashes in your picture are actually on the eye).
Those extra details might help if you wanted it perfectly real looking... but your eye looks great as it is, really, especially if it was part of a larger drawing