Well for races that are
supposed to be identical-looking it's fine. If the portrait looks like a distinct individual, and the population icon looks exactly the same, then it's not so good. Mainly this happens with humans and near-humans, because we can tell they look like an individual.
For example, the default Terran set... that admiral with the big schnozz is OK for the leader, but having cargoloads of identical population with the same nose and the same medals on their uniforms, is peculiar. Even worse are the ones that use photos of media stars. I kind of like the TOS (Trek original) set, except that its portraits make it look like the "Empire of Captain Kirk Clones!"
On the other hand, all those Jraenar look the same to me - I guess I'm biggotted.
PvK