If you're interested in photography, or if you're a (web-)designer looking for photography/image materials that are License Free (CC0), you surely came across unsplash.com.
I'm having a profile on unsplash for some years now and I'm contributing photos once a month or so. And they're very good performing! So if you're interested, check out my profile!
Unsplash is such an awesome website! It started as a small community, evolving over years to one of the best ressources for license free photography. The community is open-minded and dedicated to bringing the best photos to everyone. They even have an own Slack channel for critique and suggestions.
If you want to see all of my most viewed (and best performing photos), have a look here: https://unsplash.com/collections/9586076/most-viewed
As I said, use them for anything you like, they're in the CC0 License.