I agree with the people who say "bring it to a 
copy place". And espeically with the person who 
mentioned that "other people like them as much as 
you do". This is true. If this sketch you like so 
much is truely a work of art, I know I would want 
it with MY cel. 

Also, a lot of interesting/important information 
could be written on that sketch. For instance, if 
it's a key cel (or end cel?). All sorts of 
interesting japanese writing exists on them 
sometimes. When i see the writing, i try to 
decipher it. I (like others have said) am really 
facinated by the animation process. Having more 
pieces = more fun! ^_^

If i were you, I would make a copy for myself. 

~Tara