To get started, begin a Google Image search and locate the Search Tools selector.
Next, click on the Usage Rights selector.
Choose the reuse license that best fits your needs. In most cases this will be "labeled for reuse" unless you plan to modify the image or use the image in a business setting.
The Usage Rights selector filters the images so that you are only browsing images that you have permission to reuse with the expectation that you will properly cite the image wherever it is used.Here's an example.
|Mars Exploration Rover by NASA is licensed under public domain|
to our students. And at least it is getting easier to find these images in the first place.
Finally, there are some tools available to help automate the citation process if you use the Chrome Browser and are searching for Creative Commons images on Flickr. It may also be helpful to know that the Research Tool in Google Drive has a similar filtering option for finding Creative Commons licensed images.