A Picture is Worth a Thousand Words
A picture is worth a thousand words! We are posting pictures and using images that we find online everyday to enhance our multimedia presentations. It is important to teach students to respect copyright and the work that people post on line. Students should be encouraged to use images that are licensed as Creative Commons or public domain.
To find these type of images in Google Chrome, follow these steps:

18 Free Image Sites and Tools for Schools
I usually check them before using the pictures because some of them would like you to put a link to their site.
Some good guidelines for using online images:
1.Give the creator of the images credit for their work (put the link from where you got the picture-you may need to actually visit the site that the picture is from as it is not acceptable to give a link to Google Images).
2. Get the pictures from a place that is designed for pictures to be shared (for example, Pixabay).
3. Use pictures at are licensed Creative Commons.
