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View of Neptune and Triton from Voyager 2 on August 29, 1989 (nearly 4 days after closest approach).
Visit http://vraptor.jpl.nasa.gov/voyager/vgrnep_img.html for more images of Neptune. (That's where I got this one.)
Click on image for a larger version
Crescents of Neptune and Triton taken by Voyager 2 on August 31, 1989.
This image is from http://www.curtin.edu.au/mirror/planets/welcome/neptune.htm.
(Larger image taken from http://www.windows.ucar.edu/cgi-bin/tour_def/neptune/neptune_il.html. (Courtesy of Calvin J. Hamilton and NASA))