The next most challenging piece of writing is the ending. Once you draw your readers in and take them through your story, you need to leave them with a satisfying conclusion. The story in a picture book must come to a natural, logical conclusion. The action should end at a definitive moment, with no plot points left hanging.
Some authors try to sum up the message of the book in the last paragraph.
If your story is well-written, the reader will know what the character learned without your having to blatantly spell it out. Once the action is over and the conflict resolved, the story ends. Anything beyond that point dilutes the impact of all that's gone before. Chapters must feel complete in themselves. Some of the best authors limit their chapters to one scene or event, starting a new chapter with the next scene.