Face image data sets available online.  In many cases you will have to email the maintainer for permission and a login, which is painless.

  * 3d face database software. (n.d.-a). Retrieved March 3, 2014, from http://pics.stir.ac.uk/ESRC/software.html
  * 3d face database software. (n.d.-b). Retrieved from http://pics.stir.ac.uk/ESRC/software.html
  * AR Face Database Webpage. (n.d.-a). Retrieved August 5, 2014, from http://www2.ece.ohio-state.edu/~aleix/ARdatabase.html
  * AR Face Database Webpage. (n.d.-b). Retrieved from http://www2.ece.ohio-state.edu/~aleix/ARdatabase.html
  * CAVE | Databases: FaceTracer Database. (n.d.-a). Retrieved October 28, 2013, from http://www1.cs.columbia.edu/CAVE/databases/facetracer/
  * CAVE | Databases: FaceTracer Database. (n.d.-b). Retrieved from http://www1.cs.columbia.edu/CAVE/databases/facetracer/
  * CAVE | Databases: FaceTracer Database. (n.d.-c). Retrieved October 28, 2013, from http://www.cs.columbia.edu/CAVE/databases/facetracer/
  * CAVE | Databases: FaceTracer Database. (n.d.-d). Retrieved from http://www.cs.columbia.edu/CAVE/databases/facetracer/
  * CAVE | Projects: Face Swapping: Automatically Replacing Faces in Photographs. (n.d.-a). Retrieved October 28, 2013, from http://www1.cs.columbia.edu/CAVE/projects/face_replace/
  * CAVE | Projects: Face Swapping: Automatically Replacing Faces in Photographs. (n.d.-b). Retrieved from http://www1.cs.columbia.edu/CAVE/projects/face_replace/
  * CAVE | Projects: FaceTracer: A Search Engine for Large Collections of Images with Faces. (n.d.-a). Retrieved October 28, 2013, from http://www1.cs.columbia.edu/CAVE/projects/facesearch/
  * CAVE | Projects: FaceTracer: A Search Engine for Large Collections of Images with Faces. (n.d.-b). Retrieved from http://www1.cs.columbia.edu/CAVE/projects/facesearch/
  * computer vision - Face Emotion Database ( FACS Database ) - Stack Overflow. (n.d.-a). Retrieved September 23, 2013, from http://stackoverflow.com/questions/8840294/face-emotion-database-facs-database
  * computer vision - Face Emotion Database ( FACS Database ) - Stack Overflow. (n.d.-b). Retrieved from http://stackoverflow.com/questions/8840294/face-emotion-database-facs-database
  * Face Database Info. (n.d.-a). Retrieved September 23, 2013, from http://web.mit.edu/emeyers/www/face_databases.html
  * Face Database Info. (n.d.-b). Retrieved from http://web.mit.edu/emeyers/www/face_databases.html
  * Face Gender Stimuli. (n.d.-a). Retrieved September 24, 2013, from http://homepages.inf.ed.ac.uk/jbednar/stimuli/
  * Face Gender Stimuli. (n.d.-b). Retrieved from http://homepages.inf.ed.ac.uk/jbednar/stimuli/
  * FacePix Database | Center for Cognitive Ubiquitous Computing. (n.d.-a). Retrieved September 23, 2013, from http://cubic.asu.edu/content/facepix-database
  * FacePix Database | Center for Cognitive Ubiquitous Computing. (n.d.-b). Retrieved from http://cubic.asu.edu/content/facepix-database
  * FACES 4.0 - IQ Biometrix - Faces Software. (n.d.-a). Retrieved October 3, 2013, from http://www.iqbiometrix.com/products_faces_40.html
  * FACES 4.0 - IQ Biometrix - Faces Software. (n.d.-b). Retrieved from http://www.iqbiometrix.com/products_faces_40.html
  * Karolinska Directed Emotional Faces (KDEF) | Emotion Lab at Karolinska Institutet. (n.d.-a). Retrieved August 5, 2014, from http://www.emotionlab.se/resources/kdef
  * Karolinska Directed Emotional Faces (KDEF) | Emotion Lab at Karolinska Institutet. (n.d.-b). Retrieved from http://www.emotionlab.se/resources/kdef
  * Karolinska Directed Emotional Faces (KDEF) | Emotion Lab at Karolinska Institutet. (n.d.-c). Retrieved September 23, 2013, from http://www.emotionlab.se/resources/kdef
  * Karolinska Directed Emotional Faces (KDEF) | Emotion Lab at Karolinska Institutet. (n.d.-d). Retrieved from http://www.emotionlab.se/resources/kdef
  * LFW Face Database : Main. (n.d.-a). Retrieved October 28, 2013, from http://vis-www.cs.umass.edu/lfw/
  * LFW Face Database : Main. (n.d.-b). Retrieved from http://vis-www.cs.umass.edu/lfw/
  * Pubfig: Public Figures Face Database. (n.d.-a). Retrieved October 28, 2013, from http://www.cs.columbia.edu/CAVE/databases/pubfig/
  * Pubfig: Public Figures Face Database. (n.d.-b). Retrieved from http://www.cs.columbia.edu/CAVE/databases/pubfig/
  * Radboud Faces Database. (n.d.-a). Retrieved September 23, 2013, from http://www.socsci.ru.nl:8180/RaFD2/RaFD?p=main
  * Radboud Faces Database. (n.d.-b). Retrieved from http://www.socsci.ru.nl:8180/RaFD2/RaFD?p=main
  * Robotics Institute: The CMU Pose, Illumination, and Expression (PIE) Database of Human Faces. (n.d.-a). Retrieved August 5, 2014, from http://www.ri.cmu.edu/publication_view.html?pub_id=3462
  * Robotics Institute: The CMU Pose, Illumination, and Expression (PIE) Database of Human Faces. (n.d.-b). Retrieved from http://www.ri.cmu.edu/publication_view.html?pub_id=3462
  * Stirling ESRC 3D Face database. (n.d.-a). Retrieved March 3, 2014, from http://pics.stir.ac.uk/ESRC/index.htm
  * Stirling ESRC 3D Face database. (n.d.-b). Retrieved from http://pics.stir.ac.uk/ESRC/index.htm
  * Welcome. (n.d.-a). Retrieved August 5, 2014, from http://faces.kyb.tuebingen.mpg.de/
  * Welcome. (n.d.-b). Retrieved from http://faces.kyb.tuebingen.mpg.de/
  * Welcome to Automated Face Analysis Project. (n.d.-a). Retrieved September 24, 2013, from http://www.cs.cmu.edu/~face/index2.htm
  * Welcome to Automated Face Analysis Project. (n.d.-b). Retrieved from http://www.cs.cmu.edu/~face/index2.htm
  * Welcome to Automated Face Analysis Project. (n.d.-c). Retrieved September 24, 2013, from http://www.cs.cmu.edu/~face/index2.htm
  * Welcome to Automated Face Analysis Project. (n.d.-d). Retrieved from http://www.cs.cmu.edu/~face/index2.htm
  * Yale Face Database. (n.d.-a). Retrieved September 23, 2013, from http://cvc.yale.edu/projects/yalefaces/yalefaces.html
  * Yale Face Database. (n.d.-b). Retrieved from http://cvc.yale.edu/projects/yalefaces/yalefaces.html