Google and Bing Image Search are difficult to filter, but we do have a few other options. These websites should work in all our browsers:
https://safesearch.pixabay.com
https://www.kidzsearch.com/images.html
https://photosforwork.com/
https://www.photosforclass.com/
https://cloudveil.org/image-search
If these sites aren't adequate for your needs, please contact us for more options.