Problems with the current gallery:
1)People from the British isles are over represented.
2)There is a pic of Sami. Sami's pop number are max 100,000. 
3)There is a pic of Chechen. Chechen's pop number is max 2 mil.
4)Yet, despite pictures of these people, there are no: Poles (pop:40 mil), Dutch (16 mil), Scandinavian(20 mil). Noone from Balkans. Noone from outside Europe but of European ancestry. So the gallery is unrepresentitive. 
5)Too many politicans.
6)These people are, for the most part, historically insignificant.

So the current gallery is simply of pretty low quality.