Did you know that part of the reason the producers in Star Trek VI had Chancellor Gorkon appear the way he did was because they wanted a sort of Abraham Lincoln appearance to him? Something noble and truthful.
I remember you mentioning this on my YouTube channel before, but I can pretty much say that iClone (thankfully) does not necessarily render out spot-on imagery of faces I choose to use. And besides, the internet is full of models (both female and male) with headshots that are perfect for making young StarFleet officers out of.
As for Klingons...I might try online mugshots.