By including an attribution and mentioning the Creative Commons license on any qualifying picture or map, I am helping students understand what needs to be cited, when, and how. 5) Posters and ...

Using Creative Commons (with an attribution) ... For example, an artist could find that his images have been used by a global corporation that might otherwise have paid a fair reward for it.

For example, you can offer your work free for use, provided you receive attribution; ... Randall Munroe’s webcomic XKCD uses the Creative Commons Attribution-Noncommercial 2.5 license.