The work known as drawing pictures is infinite. You can keep drawing on one sheet forever, wondering where the best place to end is. The same goes for a story. For example, if you have the setup of a lover falling to the bottom of a deep hole, but a friend you don't like can take the lover's place and save them if you push them in, what would you do in that situation? Would you push the guy you hate in? I don't think it's the correct action. If you start thinking about it, the infinity of answers begins to disappear. As a side note, drawings are only completed when your heart wants them to end. That's my personal opinion.