it's true! we're used to seeing people with some altered proportions, so when you draw them it's easier to go "outside the lines" to capture the differences they have from a perfectly proportioned face.

problem with all that, as far as i can tell (for myself), when a person has those magical proportions, we're so used to altering them, so it's very hard to keep with proportions. a lot of the times for me is that i'll tend to add something out of the ordinary, and that doesn't exist to help me move on with the rest of it. but then, of course, i look at the final and it's never right.