actually one of the reasons i had to make my own face, so to speak. was because there is no hard and fast reference for him.
in the original advent children movie, they went for a very square jawed, almost western appearance (well, as western as you can get for an anime). it's like they took all of the cliché things about villains in manga/anime... square jaw, high cheek bones, low brow etc. and then feminized them.
anyway, they updated the model for the crisis core game FMV's they softened him up a whole lot, even the proportions of his face are different, the distance from chin to hairline particularly is shorter.
in Dissidia they used the same model (i think) as crisis core
in Dissidia 2 they completely changed his face, it's longer than crisis core, and more slender. it's also softer and has some really strikingly anime features, the nose in particular is far slimmer than it was before.
and finally, in the blu-ray release of Advent Children, you can actually see they used TWO different models. in any scene that was present in the original DVD release, it's the original model, any of the additional Blu-Ray scenes are completely different, he has a hyper stylised face that's extremely round, femenine, and almost faerie like.
that's my observation anyway.
like i said, i appreciate the feedback, it's just not something i can act on right now.