In my attempt to do something Animal Farm based, I started aimlessly drawing pigs in clothes. The pig on the left was my fifth or sixth sketch. He reminded me of Pappy O'Daniel in "O Brother, Where Art Thou?" That became my inspiration. I based the rest of the drawing and colors on that theme, still trying to include the idea of the evolution of the pigs from Animal Farm.
If a pig had wings, it would be an eagle. If a pig wore clothes, it would be Charles Durning.