Be sure you are familiar with citing websites properly before learning how to cite images. Most images come from the Internet and you'll use cite them much like you would a website. See Ms. Ledford if you have questions. Be sure to check out the screencasts on the right hand side of this website. They will show you step-by-step how to create citations for images in NoodleTools.
For more information, see that page titled RESEARCH: WHERE TO BEGIN.