After I had drawn this sketch I had the choice of redrawing or do a digital retouch. The right eye of this girl was way too big, so I shrunk it, which made the pupil too small, which in turn had to be redrawn. I wonder if redrawing would have been just as fast.
If you look closely (or if you have an experienced eye you see it at once), you will see that the lines in the right (her right) eye are thinner than in the left eye.
That is all.