/ic/ - Artwork/Critique

this is boring and unclean for an animation, it was more an exercise to draw the human skull and the sternocleidomastoid muscle.
how do you implement those space charts that animators mark on their drawings correctly?
I mean, I read it up in the animator's survival kit, but when I try to use it, it feels even less than guessing, totally lost there. like I would pretend to animate, it's no usage to me.
how can you successfully guess the amount of frames that the action would take? is that something that comes with experience?

I know that if the cervical vertebrae would move in real life as much as I animated them, it would actually break the neck. and the spinous processes are excessive.
still, I tried to animate the sternocleidomastoid muscles in action. it's all a mess, but it was still fun.