Cite the image as an "image (born digital)" in NoodleTools or NoodleTools Express, or by following the format below:
Contributor(s). Title of Photo/Image. Date. Name of Website,
Publisher, Date of Publication, URL.
Note: Contributor means the photographer, illustrator, or other artist.
If you are not required to cite images, you should at least record the URL of the page it's posted on so you can find it later if you need to.