Do bad pictures screw up facial recognition?

[Mad Mac Maniac]

On iphoto my facial recognition isn't very accurate.

Is this possibly because I tag nearly every instance of a person? Meaning if they are turned completely sideways... Or if they are making some really weird face... Or if part of the face is obscured... Or it is dark and difficult to make out... Or far away and difficult to make out... Or maybe even facing the other way!

I would like to tag my friend in each of these scenarios, but I don't want the facial recognition software to try to merge the all the scenarios above with good pictures and end up not recognizing anything.

Would it be best if I only tagged the good pictures? (and then would there be some way to tag the person without tagging the face?)

 

[BAC5.2]

I have lots of far-away photos and off-angle photos, and over the time I've been tagging it seems to pick things up and rarely makes errors anymore. It picks up sunglasses and things like that without a problem.