Im not sure if anyone else has noticed but nearly all of the human female faces are very blocky. It looks like a problem with the normal map as modders on PC have updated the textures and fixed the problem. -- http://www.skyrimnexus.com/downloads/file.php?id=30 --

If your artist arnt sure what they are doing, There are many tutorial on the web about the correct setting for exporting maps from both z bruch and mudbox.

----------------------------------- http://www.google.com/search?btnG=1&q=exporting+normal+maps+from+zbrush+tutorial