Certain images are unlikely to contain personal data. For example:
when individuals are incidentally included in an image or are not in focus (this is common during street photography)
when an image features someone who has died
when an image is being used for journalistic, informational, literary, artistic or research purposes
If an image does not constitute personal data, a business does not have to adhere to the usual data protection laws when using it and a Model Release Form is unlikely to be necessary.