I've always been critical of V.I., but most specifically one component of V.I. I am aware that visual identification takes into account several things in order to identify a person's type. However, I don't believe V.I. should even take into consideration of a person's facial structure. That is because someone isn't going to have round eyes or a pointy nose because of the way their brain developed. They will have that as a result of their D.N.A., meaning whatever they inherited from their parents.
However, I believe that when it comes to facial expressions and mannerisms, it can be very efficient in identifying someone's personality type. I've noticed people that look alike, but their facial expressions made them look very different overall. If two identical twins had a different personality type, they will look different and give different vibes as a result of the different facial expressions.