Here's an interesting infographic on the importance of note-taking: Note-taking Tips for the 21st Century. It's very important. Read all about it!
You should also consider The Impact of Writing on the Brain.
Illustration. Photograph. Encyclopædia Britannica ImageQuest. Web. 24 Jan 2014.http://quest.eb.com/images/118_812421
Copyright: Using Google Images
Also take a look at the 12 Must Have Resources for Free Public Domain Images to Use in Class.
Oh, if you don't consider yourself a conscientious researcher, you may want to use Creative Commons images anyway:
Digital Man. Photography. Encyclopædia Britannica ImageQuest. Web. 24 Jan 2014.http://quest.eb.com/images/139_1969141