> If I share a photo, it’s still my photo

This is where it becomes murky for me.

If you send me that photo via email, should you subsequently be able to revoke my access to that photo. If so, by what means?

If you used a closed messaging system (say Facebook's messaging system, or Apple's Messages), should you be able to revoke access?

If you follow the argument a hop, skip and a jump away, what happens if I submit a photo to a publication and they run it on their website? Can I revoke access? What if that publication has published that photo in a physical form?

ie, where is the line where a reasonable person should expect that the data they have willingly shared/published has slipped beyond their control?