Attendees can add a profile picture after they have completed registration for your event. Their image can appear in the attendee account menu and in attendee-facing areas such as live chat or the attendee directory, where those features are enabled.
Sign in to the event as the attendee.
Open the profile/account icon in the event header.
Select Edit Profile.
Upload an image in the Profile Image field.
Click Update Profile.
The attendee's email address is shown in this profile panel but cannot be changed there.