​​⛔ Criticism:
- The resolution of the generated face is only 256x256.
- Generated frames appear to be blurred (not sharp), due to missing fine details on the face. Adding a discriminator might help to get more realistic renderings.

💬 Conclusion:
I talked to Olivia (the first author) and overall it is a very nice work. They propose an interesting self-supervised method, which produces vector fields to transform a source face into a generated face with new pose and expression but the same appearance.

Links:
[1] Bringing Portraits to Life, SIGGRAPH Asia 2017, http://cs.tau.ac.il/~averbuch1/portraitslife/elor2017_bringingPortraits.pdf