In these situations, I make known in my answer to their inquiry that ID will be asked for at check-in and they must agree to disclose.
Police and the judicial system do not respond well to landlords who let anyone in their home without reasonable assurance of their identity
"Really, he's Frank the thief from down the street? He said he was John the banker from Boston..."
One time a guy cancelled because of my requirement - good for me.
While making our job easier, not having a face picture is not a red flag. Women especially have reasons to be discrete.
Some people want to express a relaxed attitude. Some people are just shy. It's all good, just ask for ID at check in.