Love the concept, wish it worked.. I have thousands of pictures of each of my boys, I constantly photograph them. But this app doesnt allow you to tilt or zoom out or move the picture in any way except to zoom in and even then it only zooms into the middle of the picture. So you have to have the persons face perfectly straight and at just the right distance for this to work.. For every picture you want to use.. And if youre like me with little kids they wont be still enough for that.
Ginger01010 about Changes - Face Tracker, v2.3