should I "Name" backs of heads as "Faces"?

Adding missing faces does not affect the face recognition - do as much or as little as you want

I am including all occurrences of the people that I want to know who are - front, back, side. far away, etc

LN

Nope - iPhoto Help can be very useful

Adding a missing face
iPhoto detects the vast majority of the faces in your photos during its initial scan of your photo library, and in scans of newly imported photos afterward.
However, if you find faces that haven’t been detected, you can identify and name each face manually.
NOTE:Only faces that have been detected by iPhoto in its initial scan of your photo library can affect face detection and recognition results. Manually identified faces don’t aid the face-matching ability in iPhoto.

Naming faces that iPhoto improves the identification process -- manually adding faces does not affect it

LN

When you say "manually identified faces" do you mean that or "manually DETECTED faces"? If I am working on BOB and Faces mistakenly suggests a face that I can and do manually name as MARK does that face get used in further suggestions for MARK? Is it only when I "Add Missing Face" and name it that the face is not used? Sorry to be so nitpicky but I have been spending time on naming faces that have already been detected but are mistakenly suggested.

Thanks
Henry

*Only faces that have been detected by iPhoto in its initial scan of your photo library can affect face detection and recognition results*. Manually identified faces don’t aid the face-matching ability in iPhoto.

If I am working on BOB and Faces mistakenly suggests a face that I can and do manually name as MARK does that face get used in further suggestions for MARK?

According to iPhoto help IF the face was identified by the initial faces scan then naming it helps, if it was manually identified then naming it does not affect the face-matching ability of iPhoto.

It does NOT depend on how the photo was names but on how the faces in it were identified


LN

Thank You

Henry

That explains why you cannot move a face frame which has been detected by the initial scan to another face. You can delete it but you cannot use (move) it to name another face - it is locked in place. If you want to name a face that was not detected you must "Add Missing Face" manually - you cannot use an existing face frame that was established by automatic face detection.