Thought this was an interesting comparison..:
"If a Hell exists for animation artists, I imagine it would involve having to work on later seasons of The Simpsons. There’s an interesting thing going on here though. Anybody familiar with animation history knows that virtually every classic cartoon character from Mickey to Bugs to Woody to Yogi became stiffer and less appealing as the years passed. It’s a good argument for why repetition is unhealthy for artists, and how it leads to artistic stagnation and an overreliance on formulas."
And here, something about Tin Tin - http://www.cartoonbrew.com/cgi/first-stills-from-tintin.html