I didnt know the correct answer, but this is what I found when doing my research. See below:
When taking pictures of identifiable people, the subject's consent is not usually needed for straightforward photographs taken in a public place, but is often needed for photographs taken in a private place. This type of consent is sometimes called a model release, and it is unrelated to the photographer's copyright.
Because of the expectation of privacy, the consent of the subject should normally be sought before uploading any photograph featuring an identifiable individual that has been taken in a private place, whether or not the subject is named. Even in countries that have no law of privacy, there is a moral obligation on us not to upload photographs which infringe the subject's reasonable expectation of privacy. If you upload a self-portrait, your consent is presumed.
What are public and private places?
For the purposes of this policy, a private place can be considered a place where the subject has a reasonable expectation of privacy; and a public place is a place where the subject has no such expectation.
Examples of private places
• Inside any private residence (including hotel rooms, tents, etc.)
• Inside any restroom or dressing room
• At any medical facility
• Inside a private room in an otherwise public establishment such as a restaurant or hotel room
• In the parts of a building where the general public is not allowed (for example, a private office)
Examples of public places
• On the street or a sidewalk
• Outdoors in an easily visible part of private property
• In parks and recreation areas that are open to the public
• At a large event where many people are openly taking pictures
• In the parts of a building that are freely accessible to the general public (for example, a foyer or lobby)
Legal issues
There are a variety of non-copyright laws which may affect the photographer, the uploader, including defamation, personality rights and privacy rights. In consequence, the commercial use of these pictures may still be unacceptable unless the depicted person agrees.
Defamation may arise not only from the content of the image itself but also from its description and title when uploaded. An image of an identified unknown individual may be unexceptional on its own, but with the title "A drug-dealer" there may be potential defamation issues in at least some countries.
Moral issues
Not all legally obtained photographs of individuals are acceptable. The following types of image are normally considered unacceptable:
• Those that unfairly demean or ridicule the subject
• Those that are unfairly obtained
• Those that unreasonably intrude into the subject's private or family life
These are categories which are matters of common decency rather than law. They find a reflection in the wording of the Universal Declaration of Human Rights, Article 12: No one shall be subjected to arbitrary interference with his privacy, family, home or correspondence, nor to attacks upon his honour and reputation.
The extent to which a particular photograph is "unfair" or "intrusive" will depend on the nature of the shot, whether it was taken in a public or private place, the title/description, and on the type of subject (e.g., a celebrity, a non-famous person, etc). This is all a matter of degree. A snatched shot of a celebrity caught in an embarrassing position in a public place may well be acceptable to the community; a similar shot of an anonymous member of the public may or may not be acceptable, depending on what is shown and how it is presented.
Examples
Normally do not require consent of the subject
• A street performer during a performance
• An anonymous person in a public place, especially as part of a larger crowd
• Partygoers at a large private party where photography is expected
• A basketball player competing in a match which is open to the public
Normally do require consent
• An identifiable child, titled "An obese girl" (potentially derogatory or demeaning)
• Partygoers at a private party where photography is not permitted or is not expected (unreasonable intrusion without consent)
• Nudes, underwear or swimsuit shots, unless obviously taken in a public place (unreasonable intrusion without consent)
• Long-lens images, taken from afar, of an individual in a private place (unreasonable intrusion)
Alternatives
If an image requires consent, and consent cannot be obtained, then there are several options. Identifying features may be blurred, pixelated, or obscured so that the person is no longer identifiable. The picture may be re-taken at a different angle, perhaps so that the subject's face is not visible.