http://thefacefactory.com/
this site i found very interesting. It looks like she takes pictures of people together and then switches there faces. Some seem to look normal till you click on them and see how they really look. A lot of them deal with switching genders.
http://www.faceresearch.org/demos/transform
This site had a study on faces, like what we are attracted to and why. Also the link i have up you can morph peoples faces together to see what they would look like.
http://www.faceresearch.org/demos/baby
What a baby would look like putting two photos together.
Some portrait photography tips.
1. The back ground shouldn’t have a lot of things going on in it. Keep it simple. Use natural light when you can, and if using your own lighting dont make it to complicated.
2. Have everything set up from location, lighting, camera settings, and where you want you model to be. Take test shots to make sure the lighting is right.
3. Back lighting the subject when your out doors can add depth to the photograph, making the photo more interesting.
4. Shooting just below the eye level can make a person look a little bit better.
5. choose a large aperture because it will decrease your depth of field and give you a blurry background. You want the blurry background to make sure your subject is the thing you focus on.
6. Have your subject focus on something other then directly into the camera lens.
http://digital-photography-school.com/4-quick-tips-for-portraits
http://digital-photography-school.com/how-to-bypass-the-portrait-mode-on-your-digital-camera-and-get-great-portrait