There are several rules which entail the necessity for a model release:
- If the person is the main subject of the photo and/or essential to the photo (the person might be a secondary subject, but still essential to the overall photo)
- When the model’s face is visible.
- When distinctive and recognisable features are visible (tattoos, scars, piercing, custom clothes, uniforms etc).
- When the photo is suggestive or contains nudity - even if the model is not recognisable.
- When the overall situation/settings in the photo (location, events etc.) would make the person who is in the photo recognise herself/himself.
- When a picture indicates to be a posed shot in studio (other elements might not be recognisable).