You are required to cite images that you insert into essays and visual presentations.
In the body of the essay or in a visual presentation:
More Farmers in Peru Have Stopped Planting Coca, Opting for Cacao and Coffee
Note. From Peruvian Prosperity: From Coca Farmer to Chocolate Maker, by N. Guitierrez, 2016, USAID (https://www.usaid.gov/results-data/success-stories/coca-farmer-chocolate-maker). Copyright 2016 by USAID.
USAID. (2016, September). Peruvian prosperity: From coca farmer to chocolate maker. https://www.usaid.gov/results-data/success-stories/coca-farmer-chocolate-maker
If you refer to information from an image, chart, table or graph, but do not insert it in your essay or presentation, create a citation both in-text and on your Reference list.
If the information is part of another format, for example a book, magazine article, encyclopedia, etc., cite the work it came from.
If you are only making a passing reference to a well known image, you would not have to cite it, e.g. describing someone as having a Mona Lisa smile.