There are 15 people in the photos (I got this by counting the number of heads) and there are 5 different options that you can change (head, left eye, right eye, nose and mouth).

So there are

15 × 15 ×15 ×15 ×15 = 15⁵ = 759,375 combinations

If we add another possible event (changing the chin), we have 6 possible options, so the answer is simply:

15⁶ = 11,390,625 combinations