There were issues a few updates ago relating to I think a Beamdog update and the local server database that handled persistent storage. I think it's all fixed now (unless your recently placed it in storage), but if you lost something I'm sure a staff member could help for replacement.
Edit Ally: For directions on how to make a character portrait from a picture you have and like, please follow this link.
For compiled Thainite character portraits (as of 17 January 2009) posted in one place, follow this link to download the ZIP file, then unzip the included files into your Portraits directory:
Also - please try to keep this thread to character portraits only and keep replies that are not new portraits to a minimum so that folks don't have to fish through three pages of chatter just to find the next portrait in the Thain series!