I believe that is Justin Sweet's artwork. Try looking at his website http://www.justinsweet.com/ or do a search of his name and look at the images under the search results.
Several portraits I've found - some of these have already been posted in different sizes; some are larger than previews at forum:
This female gnome portrait looks off in IwD EE, like it has been enlarged from a smaller image. Since I have it large I made thise portraits for game. If you want to use it, save it as GFW_L.bmp & GFW_M.bmp (with this name it will replace the portrait in the main portrait change window):
Beamdog could update it in the game and/or patch/update.
@semiticgod, there were promotional IwD & IwD2 materials online back in 2003 on sites now gone. I'm sure BIS had all of the images in higher resolution as they were painted big. Only some must have gotten lost, thus some portraits in IwD EE are blurred.
Update.
One more high res and portraits slightly bigger than in game:
Comments
This female gnome portrait looks off in IwD EE, like it has been enlarged from a smaller image. Since I have it large I made thise portraits for game. If you want to use it, save it as GFW_L.bmp & GFW_M.bmp (with this name it will replace the portrait in the main portrait change window):
Beamdog could update it in the game and/or patch/update.
Update.
One more high res and portraits slightly bigger than in game: