Yes,

   You a reproduction cel out of a sketch.  I've 
done it before.  It's easier if you have the 
sketch but you can play around with adobe or some 
other drawing program and get the outline.  Of 
the two (sketch or cel), I think the cel is more 
important to have if you want to make a copy.  

   One question I do have is the fading of 
paint.  I've made even the lines of my fancels 
out of paint using a paintbrush.  This makes it 
very tediuous and time-consuming.  Are there pen 
like "thingies" (for lack of a better word) that 
are more resistant to fading and easier to 
apply?  Brushes also make the line thickness hard 
to control.  

   Any insight anyone has would be greatly 
appreciated.  Here is a cel I reproduced 
(yeah...no originality but took a heck of a long 
time for me to apply the lines by brush).  I'm 
thinking of making an original one next time -- 
maybe her playing the violin or something...any 
suggestions?