First of all sorry about how boring this page is, but it's just something useful and not supposed to be too special.
Anyway, just click on the portrait you want to download. Use winzip and unzip the file in your "portraits" folder in the NWN directory. And... now you can see me ingame! :)
Also, make sure you've disabled download managers such as Download Accelerator or GetRight, they seem not to work with these files. Instead use the good old right click and choose Save As.