Using someone's image commercially without consent can infringe their privacy rights under UK GDPR and common law. A model release is a consent form (also a contract with consideration) granting specific rights to use a person's image. For minors, a parent or guardian must sign.

• UK GDPR: images of identifiable people are personal data
• Commercial use of a person's image requires explicit consent
• Consideration (payment or other benefit) makes the release contractual
• Minors under 18: parent or legal guardian must sign
• Revocation: consent can be withdrawn for GDPR purposes but contractual claims remain

Legal reference: UK GDPR Article 7; Human Rights Act 1998 (Article 8 privacy); contract law