Puppeteer Lounge animation instructor, Bill Broeckel shares his opinion on facial animation polishing:

“Often times when animator run into polishing the facial animation, it
becomes intense and confusing! Keys get shuffled all around and you need
to be able to keep track of them so to spot errors quickly, or when you
have a hiccup and are wondering what’s causing it. The curve editor
will of course come into play as well, but not as much as for the body;
it’ll be more of like a rough pass to get some curves going and then the
rest is just placing keys and not worrying too much of what the curves
are doing.”

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