Are you looking for free and open images? Here are some websites you can refer to.
Note: Before using these sites, always check the terms and conditions for the website plus the licensing information for each file before downloading and using. Remember that attribution is always required. If you are unsure if you can reuse a resource, contact the Copyright and Open Scholarship Officer for advice.
UniSC staff have access to more information on MyUniSC about finding images (login required).