Find free-to-use images
When you do a Google Search, you can filter your results to find images, videos, or text that you have permission to use. To do this, use an Advanced Search filter called "usage rights" that lets you know when you can use, share, or modify something you find online.
You must provide citations for images, just as you do for words, quotes, and ideas. Even if you find the image through Google, you must click on the image and go to the original source for the image (which won't be google -- it will be another website). To get to the original source, click on the image and then click "website for this image," usually on the upper right side of the screen. Here's an example of what happens when I want to cite this picture that I found by doing a google image search for "elephant":
Utilize Search Tools in Google Images to help define the images you want and
to search by usage rights.
Select "Labeled for Reuse" to find images not protected by copyright.