Do people have different-sized eyes?

Of course, but the difference is not that significant. Also your eyes grow until you are about 8 years old. According to Wikipedia: > The dimensions differ among adults by only one or two millimeters. read more

The shape and size of the eye is affected by many different structures around the eye, including the eyelids, brows, bony orbit, and cheeks. In the included photo, there appears to be some brow asymmetry with the right brow lower than the left, which subsequently makes the left upper lid appear more open. read more

And so, my eyes aren't fully open all of the time. In which case, it's fairly noticeable that I've got twice the amount of eyeliner on the monolid eye than on the other one, which looks a little odd. You may not have this issue, but just be aware that it really only looks 'correct' when you do have your eyes fully open. read more