Another thing about faces. A face is a 3D form, and people's heads move so often, that our memory of that person is more of a composite than one particular image. That's why sometimes not even photos look like the actual person. So, unless you look at yourself a great deal in the mirror, you might not even have that composite memory of what you look like, and no drawing would ever really look like you - to your eyes.
Just a thougtht.