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I was wondering should you get a contract signed from the person who is interested in participating in the shooting as a subject.
Whenever possible you should get a model release (or a contract with a model release clause) from anyone who appears in your photos or video, this can save a lot of trouble in the future and has no downside.
If you do not have a release (for property, too.) your images are unusable. You cannot display them in public. You cannot use them in your portfolio. You cannot use them.
ONLY EXCEPTION: I worked as a news photographer—anything goes.
Required, but never shown