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hmmm yes, it depends on the production though. sometimes there's no time to show your thumbnails to the director. but it's very useful to sketch a few out fr yourself to clarify and solidify your idea before you start actually animating.
But if you get very fast at it, you can indeed show it to your lead, supervisor or even the anim director, if he has time. Especially in TV animation it's all about trying to make your workflow as effective as possible so you save as much time as possible. XD

@ellyn-suraya, the yoda of MPC, Montreal has spoken. ;) Better listen to her tips. :D

hahahahaha omg stop it. *blushes furiously *