Rough Animation (left) Clean-up Animation (right)
In 2D animation the “Clean-up” artists create the final drawings that you see on the screen. There’s often a misconception that they simply trace the rough animation given to them. Here’s an example of how much clean-up artists actually do at times

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Prince of Egypt director’s commentary: [Working on this sequence a “million” times] “Just trying to figure out what Rameses’s reaction would be when Moses returns. Would he be angry, would he be flippant, would he be overjoyed, what would he be? And because we built such a relationship between the brothers before and they had nothing against each other when Moses left, other than love and regret that he was leaving, it had to be joyful.” (3/?)