Ugh.
There's little point in having a member photos column on your membership list page if most of them have no photo.
Don't wait for a member to upload their photo. At least for our club, few if any will do it. Or they won't crop and size it correctly (300px square seems to work best). Find ways to take photos, then crop and size them and add them to the member record.
For our club, we have monthly luncheons and the members have to check in to get their lunch ticket designating their menu choice. It's an ideal time to pick off a member missing their photo and snap a quick pic.
How to List the No Image Members
You want records with the photo field blank.
Method 1: Use Participants Database→List Participants
Method 2: Use pdb_list on your members page
Add the photo field to the sort fields in the short code. Then run the page and search on the photo field with a blank search field.
... search_fields="last_name,first_name,photo" ...
Method 3: Set up a report page for members without photos
Use a shortcode like this:
[pdb_list fields="last_name,first_name,photo" list_limit="100" orderby="last_name,first_name" filter="photo="]
Set the list limit high enough that you get all of them.

