Here are some various gag drawings and caricatures from various golden age animation studios (Disney, Warner Bros, MGM, etc.).
Some notes on old WB animators by Jaime J. Weinman (referencing the observations of Greg Duffell)
Robert McKimson drawing Bugs Bunny.
It’s a damn shame McKimson doesn’t get the full credit he deserves as one of the best animators/directors in cartoon history. He’s one of the few that can always get a belly laugh outta me.