Copyright trolls are hard at work exploring the web and demanding payments for improper use of copyrighted images. Make sure your site is clean by either using your own images or licensed photographs. An alternative is to use royalty-free images.
There are several sources of royalty-free images on the web, including these organizations:
– [Pixabay](https://pixabay.com/)
– [Unsplash](http://www.unsplash.com/)
– [Reshot](http://www.reshot.com/)
– [Burst](http://www.burst.shopify.com/)
– [Pexels](http://www.pexels.com/)
– [FreeImages](http://www.freeimages.com/)
Note that not all their images are free, so ready carefully before using.