A picture of a person, taken in public, does not capture anything that the person did not choose to show in the first place (unless we are taking about extraordinary circumstances, like a person falling, etc, that does not apply to the OP).
If the lady did not want her shoes to be seen, she would not have put such shoes on, or her husband/father/mother/whatever would have not let her put them on. I don't see why random people looking at her shoes is ok, but someone photographing them is not. Call me culturally insensitive, but I honestly don't see the difference between "seeing" and "photographing"
But some do see a difference. The Amish, for instance, tend to view photographs as graven images, don't like having their photographs taken, and disapprove of portrait photography.
Fortunately for those who don't respect their views, they're also pacifists....