How to merge faces in photoshop

As many you asked, how do you blend face swaps in Photoshop?

Amazingly, how do you morph faces together? Future Baby Maker | FaceFilm 4+ FaceFilm is an easy-to-use app that allows you to morph images of faces together and create videos of the process. The transitions between pictures are really smooth and give impressive results.

Furthermore, how do you switch faces on pixlr?