Doesn't work for me. Most charismatic dictators were ugly as frogs.
It may be true that you make your first opinion on a person on the looks. But realize that this includes styling like clothes, hair and makeup etc. The facial proportions would only affect it if they are either out of the norm or are appealing or disappealing to your own personal preferences.
The moment you initiate a conversation is the moment where your inherent charisma decides where it is going. There are people that may shit talk you but you still "like" them.
What i would like in charactrer greation is an attidude option that limits or affects emotional or facial reactions.
Creating a coldhearted, evil cleric and then seeing him with all those pitiful emotinal reaction is pretty "meh!"