Reference list
Author, AB (artist, person or organisation responsible, if known) Year, Title of image (or a description), description of item (eg. image), name of organisation or website, viewed Day Month Year, <http://xxxxxxxxxxxxxxxxx>.
Schumin, B 2011, Qualcomm QCP-2700 vs iPhone 4S Black, image, Wikimedia commons, viewed 7 October 2018, <https://upload.wikimedia.org/wikipedia/commons/9/93/Two_Cell_Phones.png>.
In-text
Figure 1. Qualcomm QCP-2700 vs iPhone 4S Black (Schumin 2011).
Notes