Tell a truthful story. Many infographics are one-sided. Don't be afraid to share information that might be contradictory.
Determine a narrow focus. A specific research question can help you & it would be smart to include on your graphic. Don't try to include everything about your topic, only what's relevant to your narrow topic.
Keep it simple. Less is usually more. Too much text or a busy image will be distracting rather than attracting.
Cite your sources. Sources of both of images and information.
Effective Design Features
Choose design features that will best help educate the audience without imagery overload:
First and foremost, you want your information to 'flow.'
Decide which type of infographic best suits your research [see link #2 below]
Titles, headers, and body text in a hierarchical structure
Potentially use boarders, lines, and/or shapes to group related information together
Choose colors and fonts that add to the flow of information
'White Space' is your friend
Choose images, icons, and illustrations that make your infographic memorable
Helpful links that discuss effective infographic design: