Permission is permission.
Consent is consent.
Do people own rights at birth? Age of majority? The trust and guardianship of a minor varies from jurisdiction to jurisdiction. I'm a guardian for an individual whose limitations prevent the capacity to thrive independently in the world. This individual is otherwise aware enough to have dignity.
Does a parent have the right to administer, guardian, or otherwise control a child or ward after 1) age of consent, 2) age of consent, or 3) age of consent, as you attempt to disambiguate consent in its somewhat artificially constructed sense?
We say that a child can't give consent for sex until an arbitrary year, which varies from 12-18 in the EU. A picture of a nude baby is not usually prurient to a "normal" individual, but is to a pedophile: porn and lascivious. When is such a photograph exposure in an indignant manner, as the subject loses the value of dignity and privacy?
In my mind, this is really about embarrassment and loss of dignity through the revelation of objects that are information that would under other terms, be of a private nature. Dignity and embarrassment start wars where people die, and borders change. It is a powerful value of self, an asset not to be trifled with. The embodiment of ideals has value, in certainty. Where does one draw the line of what is a loss of dignity, and the rest is: STFU?