People cannot download or use images from Google without seeking permission from the copyright holder unless your use falls under one of the exceptions under a creative licence such as Creative Commons. Google Image also offers a tool to filter your search results by usage rights.
Places where we can find images that are available for our work include Image Quest, Pixabay and Canva. Applications such as Adobe and MS Powerpoint also offers ways inside their programs to find free images and cite them. Ask Ms Parsonson if you are unsure.