Use Search Tools on the Image results page or use the Advanced Image Search feature to then limit your search to:
By Design: Markus Büsges, leomaria designbüro, Germany [CC BY-SA 4.0], via Wikimedia Commons
It's one thing to search by keyword to locate images on your topic, but what if you're starting with an existing image and you want to track backwards? You might want to find out where an image originally came from or determine who created it. Attribution is an important consideration. Here are a few other reasons to consider doing a reverse image search: