Your Union and Employer are working to ensure your image and right to privacy are protected. You are not required to have your image taken or used at all.
From – A Guide for Individuals; Protecting Your Privacy – Office of the Privacy Commissioner of Canada:
With technology now affecting every aspect of modern life, there has never been a more important time to think about your privacy, and to safeguard it… your personal information should only be collected, used and disclosed with your knowledge, and often your consent, for legitimate purposes. It must also be stored, shared and disposed of in a way that keeps it secure and confidential.