Pose change!
To correct what I said earlier-- It's not an expression, you can't have multiple of them, but we do have a rule allowing a change of head if that's what you'd like to do:
It is within the rules to:
- have a single alternate movement of a single body part that is drawn differently (head, single arm) so long as it doesn't change the pose, and so long as the VN does not also use the allowed "extra item