To avoid legal repercussions, you can use the Creative Commons license function on Google Image Search to find Free-to-Use images.
Important Notes:
Reference this article to find out if an image is truly Free or Safe to Use: Is it safe to use Google Images?
The Creative Commons license image may be free to use, but the Related Images that appear with the free image may not be. Always double-check to make sure a related image is free.
Please look at our article Alternatives to Google Images for other ways to find free photos.
Disclaimer
Although Google makes it easy to find images you can use, some risks are involved. Even though there are images available to use for free, it is often better, in the long run, to take your own pictures or use pictures that you own the rights to.
Instructions
Navigate to Google Image Search
Enter your search criteria and click Enter on your keyboard or click the Magnifying Glass to initiate the search
Click Tools at the top of the page
Select the Usage Rights filter
Select Creative Commons license
Select one of the images
Note:
Always double-check any Related Images to see if they are free to use. You cannot assume they are free-to-use.