On the Australian passport, only Muslims are allowed to cover facial features.
Only religious reasons are acceptable excuses for covering hair, ears and facial contours. And only Islam has such religious reasons. From the Australian Govermnent's general photograph guidelines:
The photograph must show you without any hat or other head covering. However, if you wear a head covering for religious reasons we will accept a photograph of you wearing it, but your facial features from bottom of chin to top of forehead and both edges of your face must be clearly shown.