Today images on the web are ubiquitous, but many images are copyrighted. Fortunately there are many websites that will allow you find royalty free images that you can use commercially. Here are a few:
Features over 610,000 high quality free images licensed under Creative Commons CC0.
Features 100% free images released under the Creative Commons CC0 license, where 10 new photos are added every 10 days.
For Flickr, please check the license before using
Creative Commons-licensed photos posted on the popular photo sharing service Flickr.