Unless they’re introduced to other options, Google Images tends to be the default image search tool for students and adults. Google Images is convenient, but it’s not the best place for students to find images that are in the public domain or to images that have been labeled with a Creative Commons license. That’s why I made the following chart that features 12 alternatives to Google Image search.
http://www.freetech4teachers.com/2018/03/12-alternatives-to-google-image-search.html