A lot of the portrait sites are now defunct.
Gray Falcon Graphics -
http://www.grayfalcongraphics.com/index.htmlNeverwinter Vault -
https://www.ign.com/wikis/neverwinter-nights (leads to the IGN page, which is... not helpful).
Plasmocat's Portraits - catalogingjunkie.net/BG Gallery/index.htm
Portraits of the Protagonist -
https://portraitsoftheprotagonist.webs.com/apps/photos/The Adventurer's Guild -
www.planetbaldursgate.com/xode/The Gibberlings Three Portraits -
http://www.gibberlings3.net/portraits/ (I think it's meant to lead here? -->
http://gibberlings3.net/forums/index.php?app=gallery&category=1)
There's several more whose websites are "frozen" so I didn't list those. I figure there's still a possibility of their owners coming back.
Cheers.