A lot of people don't want images of the cels 
they've bought being displayed. I think that the 
scan you made is yours to keep; just stamp a 
little "SOLD" sign on the image to show you're no 
longer the owner.

In the future, if you want to display your sold 
cels, make sure you state those terms to the 
buyer.

I wouldn't give in. Not using credit cards, I've 
made a lot of sacrifices for what I've 
accumulated. It's been an honor to have had every 
one of the cels that have passed through my cel 
books. I have no doubt you feel the same way 
about yours.