The portraits (avatars?) provided in the game to represent you and the AI players are pretty rough. They look like they were drawn by the same guy that did them for Galactic Civilizations II, in which the portraits were also pretty weak and surprisingly amateurish. Better than I could do of course, but not a whole lot better.
I hope the artist is not the chief designer's middle-schooler son or something. I don't want to hurt anyone's feelings, but these portraits are not up to the quality of the game graphics. They should at least supplement these existing ones with some others done in an entirely different style.
Go to the local book store and read the artist's name off of any decent sci-fi paperback. Those are all much, much better. With all the 100,000 copies sold they could pay one of those guys to crank out a half dozen headshots of people and aliens.