"Those sight gags are quite limited. You know, there are only so many things you can do with a human body or a duck body and then you start repeating yourself, otherwise you'd kill him.", www.cbarks.com: The artistry: Comics writing, "Avoid excessive distortion of beak and brows. Tilting eyes is key to most expressions.[...] Use this eye tilting cautiously! It's awfully easy to tilt these eyes too far!", Barks model sheet #1, 1950, "Using the hands to 'talk' with is fine sometimes. But this kind of emphasizing is wearing on the reader! [...] Overacting can be overdone. Save big takes for direst calamities!", Barks model sheet #2, 1950
Stajano, Francesco. Don Rosa interview: before the Ducks, published in Castagno, Paolo (ed.; 2011). Don Rosa: A Little Something Special, p. 37, published as a bi-lingual (Italian and English) print-on-demand book by www.papersera.net (no ISBN, but see http://www.papersera.net/papersera/DonRosa.php for information)