Ok, my understanding of this is that you need both a portrait style photo with the guy facing completely forwards at the camera, and a picture from the side, basically like a mugshot pic.

One thing that is likely as I've found using a similar feature on a football game is that light & shadows on faces can mean that one half of the face can look weird, and lead to a sort of 'panda' effect on the result. I will try to use photoshop to undo this on any fighters I post up & would advise others to do the same.

Will try post up a Mayweather one tomorrow