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` ` = 15^5` `= 759,375` combinations
If we add another possible event (changing the chin), we have `6` possible options, so the answer is simply:
`15^6= 11,390,625` combinations