Well for the very last point, you're directly violating their privacy - observing them rather than creating a fictional depiction of them. It's worse, but that doesn't make it okay to create the fictional media. To repeat myself, that's not okay. Don't do it.

It's just not in any way an interaction with another person. The distinction between moral and practical rules is meaningless to me outside of interactions, so I'll leave it at "It's bad; don't do it."