This is artwork from the filmbooks, CDs, posters, and etc.  Some pictures might look like screenshots, but I have scanned almost all in from the filmbooks myself!
This is artwork from the Manga or Novels, or Rui Araizumi artbooks I own.
Currently 30 images!!!
This is artwork from Slayers Doujinshi (fan comics).  Where possible, I have included descriptions of the stories.
                                 
These are animation production cels of Sylphiel. They make great transparent .gifs if you need some for your webpage.
                         
These are screenshots from the first season of Slayers, where dearest Sylphiel first made her appearance!  She's sooooo cute!
                                  
These are from the NEXT season where Sylphiel next appears, no pun intended.  Some have black spots for a nose and it looks hideous, but...
These are Sylphiel with her friends, not screenshots however.  These are generally official art.
These are sketches of Sylphiel, either from artbooks (I guess!) or cel sketches. Very cute!!!