@Tammy91, AirBnB *claims* to require a profile pic to become a verified member.
The fact that I have received bookings from what appears to be a potted plant indicates otherwise.
You are free to ask the member to provide an actual photograph of themselves. If the person refuses, you can contact AirBnB support and tell them you are not comfortable with the IB if the guest refuses to provide the required photo. They may reach out to the guest and ask them to provide a picture (or not). But either way, AirBnB can cancel the booking for you without penalty if you tell them you don't want a photo-less guest.