Hey, I've been practicing drawing for a while now (specifically anime/manga style, but just drawing in general) and I've been having an awful lot of trouble leveling the eyes just right. No matter what I do, a pupil might be a little off, lowered slightly or higher than the other. Is there any tips or tricks I can learn to know how to level eyes correctly? I'm so tired of erasing eyes to the point that I'm smudging the paper and ruining the whole drawing ><