The previews were done with Paint Shop Pro 9, which is what I also use along with NifSkope to work on the Leaderheads.Looks great! What you are doing them with?
Glad to help Wyz & glad you liked them.
[EDIT] You may want to mention that the preview images above include a few new leaders from my modpack that were not in the initial 4.0 release but that you are adding to CIV Gold.
Or maybe make it a game and see if anyone can pick them out?
My vote is for Haïle Selassié, Sunni Ali & Narbona.
i noticed none of the new leaders for the normal, existing civs made the photo?