Including a copyright notice on a webpage with copyright-free images is not necessary, but it can still be beneficial. While copyright-free images do not require a copyright notice, having one can help reinforce the fact that the other elements of the webpage are protected by copyright. This notice serves as a reminder to visitors that the original content on the page, such as text, logos, or original artwork, is owned by the website's owner and should not be used without permission.
Additionally, including a copyright notice with the correct year of publication and the website owner's name can help establish proof of copyright ownership, should an infringement case arise. It can also deter potential infringers by making it clear that the content is protected. Overall, while not required for copyright-free images, a copyright notice can provide additional protection and clarity regarding the ownership of the webpage's content.