Cosmetic packs, what do they include?


Hi, I'm thinking about getting the cosmetic packs for my gangs, but I'm not sure about what do they include. From the picture it seems like it could include new faces, but at least from the image for van saar and escher they seem to be the same as the already available ones.
So what do they include? And once bought, those cosmetics are available for free or it does cost credits to apply them?