Thank you very much for your nice comments!
Kekso, here you can find a deep explanation of my painting system: viewtopic.php?f=15&t=4016
Don't hesitate to ask if you need further details.
Zed1, I think as far you can't be taken for a British or Zulu you're safe
Duke atreides, the only thing you have to do is to shave them other than you want to convert them into Taliban
Konrad, will be a pleasure to see this figures painted by you, better than mine for sure! In the meantime Romans are good choice
Tuthmosis III, well they're armed with Mauser carbines (inappropriate), hunting rifles (mmm...maybe...) and pistols that clearly are not Colts or Remington but can play as a Beaumont-Adams or LeMat. And I don't know about wearing cartridge belts across the shoulders. But Mexicans did, so perhaps...
In general I would say that they look too modern for ACW but depends on your tastes. I did not use all the figures, so there is a few more poses on the set http://www.plasticsoldierreview.com/Review.aspx?id=957