As talented as the illustrators at Disney and Warner Brothers are, even they cannot draw their expressive characters out of thin air. They, and other professional animators, often use mirrors to model for themselves as they draw their characters' frowns and grins.
The sight of these legendary professionals form the 1950s and later sitting at their tables as they leer and glare at themselves will definitely bring a smile to your face, so take a look!
More info: Life (h/t: Join_You_In_The_Sun)
