How many pieces do you have to change before it's not closely enough related? If every piece is modified, is it the same base image? If it's not the same image, when does it cease to represent the original and must be reassessed? If it's no longer the image of a real person, given the extreme variety in both real and imagined people, how can an AI image ever be illegal?
If you morph between an image of a horse and an illegal image, at what exact point does it become illegal? What about a person and an illegal image? What about an ai generated borderline image and an illegal image?
At some point, a legal image changes into an illegal image, and that point is nearly impossible to define. Likewise, the transition between a real and imagined person is the same, or the likeness between two similar looking real, but different, or imagined people.
Good luck both policing it and having a society with a healthy relationship with our biology and Ai technology without some sort of societal perspective change.
Most people don't need social media to be justified in being dissatisfied with their body image