Some sources of free nursing images include Wikimedia Commons and the Creative Commons section of Flickr. Both sites provide media files that are free to use, so long as users provide appropriate attribution.
As of 2016, Flickr’s Creative Commons section had a wider selection of nursing images than Wikimedia Commons, though both sites are regularly updated. Both sites work by assigning tags to photos. To find the widest selection of photos, try several keyword combinations. Images of other medicine-related subjects, such as doctors, hospitals and emergency rooms are also available on both Wikimedia Commons and the Creative Commons.
Be sure to note that Creative Commons images are often labeled as "some rights reserved." It is important to read the detailed information about usage rights before republishing the photos.