Photoshop has the liquify filter that can be used for this purpose and in Photoshop 5.5 it has now become even easier to change a face. In a few minutes, your model has bigger eyes and a smaller forehead. Let's see how it works.
Start with opening a picture with a face. Hit CMD J to duplicate the layer.
Now open the liquify filter.
With the 5.5 version of Photoshop, Photoshop will detect the face of the model in your picture. And with the sliders in the Face Liquify aware section it's very easy to change the face.
It's very easy but I'd say: keep it subtle and most of all: keep it natural.
And have you already discovered our brand new Facebook page Humans of the Nordic Region?
picture from Pixabay.com