“Proportions.”
On the other hand, the situation gets even more complicated when people upload photos of themselves that haven’t been changed in any way. Having to deal with the challenge of having to deal with unreasonable ideas about physical appearance is already a challenge in and of itself. It’s not clear whether the editing process changed her head or her arms, but it’s likely that it happened in both places.
It doesn’t look like either her arms or her head have been changed. it’s possible that both of them were changed in some way. In any case, it is clear that the picture has been changed in a way that is completely incomprehensible to a human mind because it has been completely changed. This makes it very clear that the image was changed in a way that is impossible for a human mind to understand.