Before you copy/paste an image (photograph, graph, cartoon, etc.) from Google, you should check whether you have permission to do so. Look for images with a Creative Commons license by using the Search Tools button on Google Image Search.
Run your search using your keywords or search terms. From the results page, click on the Tools button. Then select the Usage Rights drop-down list for the appropriate option, e.g. Labeled for Reuse:
Other sources for Creative Commons licensed images are Flickr.com and Pexels.com.
When using material that you find on Google or Google Scholar, including images, it is important to remember that copyright still applies.
Copyright is defined by the Copyright Licensing Agency (CLA) as:
"Copyright is one of the main types of intellectual property. It allows the copyright owner to protect against others copying or reproducing their work."
https://www.cla.co.uk/what-is-copyright
You must always reference sources correctly. Only re-use text or images where there is permission to do so and remember to reference the owner/author.
Check the Referencing LibGuide for more information.
You may also wish to look at or LibGuide on using images in teaching and learning.