The Liquify Filter in Photoshop is a very powerful tool for image manipulation.
1. Adjust some of the faces in the files at the bottom of the page with Liquify and post the screen shots to your web site as Exercise 13. (Or, take a couple of selfies on your phone - one straight on and one profile photo - and email them to yourself.)
2. Use Photo Booth and the Mirror Filter to try and make a perfectly symmetrical version of your face. Then take a regular face forward portrait and compare the two.
3. In Photoshop, use the face forward image.
Select the right half of your face and copy the selection to a new layer. Flip the new layer horizontally and line it up with the other half so you now have a face built from two identical halves.
Do the same thing with the other half of your face.
Compare the two. Interesting, eh?
Post a screenshot of each version of the full face composite.