How to know when we're finished... it's almost never finished feeling, but then we might reach a state of impatience and feel eager to pursue new interests?
Also depends on the number of pumpkins the piece requires.
In my pumpkin opinion your piece looks complete. Looks like you could call it done. That scene is all occurring inside of a giant pumpkin, right? I think my cousin had similar parasite or something. Looks awesome.