Getting images that are free for re-use
Head over to images.google.com to do your search.
Once your image search is on the screen, select Tools, then Usage Rights, then “labeled for Reuse”. The images that appear on the screen are already labeled to be used at will.
If you do not find the image you want, there is probably a good one at one of the public domain photographic sites. Check them out instead of taking a risk on the images from a general Google results.
Or find a picture you really like at Shutterstock. I can recommend their quality and variety. They even have video clips.