It’s easy to find Creative Commons-licensed images for use in your blog posts. Try one of two methods.
Go to the advanced search page on Flickr and enter your search terms. Before you hit “search,” however, make sure you tick the “Only search within Creative Commons” box at the bottom.
After doing a Google image search, click on the “Search Tools” at the top of the page. Click on Usage Rights and then choose “Labeled for reuse.”