These files are not essential to the server (you can play without them) but they do offer an incredible amount of unique choices for character portraits.
The Portraits folder has been broken into 4 parts.
Once the files have been downloaded, you place the portrait files into a "Portraits" folder under where you installed Neverwinter
ex. C:\Program Files\Neverwinter Nights\Portaits
They will not show up if the 4 files are placed in there as downloaded. The individual portraits need to be un-rar'd and placed into the "Portraits" folder in the Neverwinter directory.
Thanks Oarthias for your portraits!