As a result, it makes a pretty smooth face transformation. The sense of cubism in the picture is well shown. Also, by applying a light texture on the face, it brings a feeling that the cubist face is naturally merging into the background and becoming a real portrait.
However, one thing I am not satisfied is that I couldn't find a good way to draw out the outline of different planes as my concept shows. Although my glasses and eyes help define some of the outlines, the cubism effect would be better if all the outlines are tracked. In addition, the picture will be more rich in stereoscopic feeling if those planes slightly break apart.
................................................................................................................................

normal face

colors start to apply and separate the face

different parts of the face start to distort following the movement

the cubism effect goes well with the background

transformation finished