>>8778443>sharp sideways shakesSimulates slapping those cheeks that even ends up 'showing' the bounce when your hand recovers from the recoil.
>steady vertical jigglingNice buttjob action, maybe try the motion in a slight arc to get more realistic.
Framing is important too, the Ryza one has too much torso so when you shake it too much of the image moves and takes you out of the experience.