Sorry to jump in, but Weltschmerz and Yesterday, The World Ended from the jam page move the heads of the sprites. Is it because they are such minor movements that the change is allowed?
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Ahh I was probably too hasty on calling it a "pose change"-- I'll change my previous answer to correct that.
A single head change IS allowed, stated here:
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"
It's not an expression, as you cannot have as many head changes as you want (just the one! as the rule states) but maybe me saying "pose change" implies it's not allowed at all-- sorry!
I hope that clarifies things! ><