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Continuing the Process
Now move on to the next frame and start the same process, building with your base shades. Using onion-skinning here wont really help you; even with the detailed background hidden, itll still be hard to see the differentiation in shades and itll just confuse you. What will help most is if you just periodically flip back and forth between frames to check the general location and shape of highlights and shadows; they dont have to match perfectly, because its moving so quickly and because of the drastic turn in angle (on mine, at least) but you do need to get it as close as possible. The quality of the end result will depend on how much time you want to spend on it.