Keep just one side with the sky blue and the back lag always dark...aswell as keep the moment flows on all positions, including the intermadiate phase:
did an arm example once that shall work for you:
3 phases on movement: Front - Middle and Back.
Observer: Watching a walking model by it's side...so that we can realize that:
The back arm is always dark
The front arm is always brighter ( to make a deeph sense )
Remember to attempt all the phases watching yourself out with colors
see ya