You may use an Unsplash photo on a website that sells a product or service. However, we do not offer a license that allows selling prints or products with images printed on them. You could, however, try reaching out the photographer directly to discuss obtaining the rights to do so. Should you wish to contact a photographer, you can do so via the ‘message’ button on their profile, if they have chosen to enable this feature.
See the Unsplash Terms of Service, Section 8G, for more information about permitted uses. We are unable to advise on individual image usage cases. If you still aren’t sure, you should probably talk to a lawyer who knows about these things.
More articles on usage can be found at https://help.unsplash.com/en/collections/1463188-unsplash-license