@Marsha181 This is a discussion forum for hosts and guests, not customer service.
Guests are not required by Airbnb to post a face photo. If you wish to require this, you need to state it in your ad, and you can message the guest and ask them to do so.
@Marsha181 you can set mandatory profile photos in "booking requirements" so guests without a photo will not be able to book instantly but they will still be able to send you a booking request. Note that they can use any photo as a profile photo, their cat, the flower... but you can ask them to change it