I had 2 cels that people were snatching from my
gallery, reproducing it and selling it on Ebay for
$25.00 each.  Annoyed the CRAP out of me!  But,
after I asked them not to reproduce them, they
immediately stopped.  So I still have them up on
my gallery.  But, if I do see them being copied
again, I will pull off my entire cel gallery.

Putting a water mark on it would not really help.
 They still have the screen caps to fill in the
"gaps".  All I can say is, you will always be at
risk of plagerism whenever you put anything on the
internet.  So if that cel is so precious that you
would rather have it looked away from anyone's
eye, then don't put it on the internet (* note to
self *)!!

Star Phoenix