On a single-author publication, if the author has supplied all the photos and illustrations, no separate graphics attribution is necessary unless the author wishes it.
For multi-author publications, the specific contributor of an illustration should be noted.
Non-author (“outside”) sources of any photos, graphs, charts, diagrams, or other graphical illustration must be cited.
Citations may be part of a caption or in a list similar to, and right after, the author listing as part of the indicia in a designed publication. The choice of location will be determined by space available in the design as well as the length and number of different attributions. For clarity, it is best to include specific attributions in the captions.