In the case of 'Smile the Book' fan fiction, it could potentially focus on the emotional aspects that the book evokes. Maybe it dives deeper into the backstories of the characters. Fan fiction authors might also play with the themes of the book in different ways, for example, if the book has a theme of friendship, the fan fiction could show different scenarios of how that friendship was formed or tested. It could also bring in new characters that interact with the existing ones in unique ways.
Sorry, I'm not very familiar with 'Smile the Book' fan fiction specifically. You could try searching on some popular fan fiction websites like Archive of Our Own or FanFiction.net.
It depends. 'Smile' could be considered a realistic fiction book if it portrays real-life situations and characters in a believable way. But without knowing more about it, it's hard to say for sure.
One popular Smile fan fiction could be about the characters going on an unexpected adventure. Maybe they discover a hidden world within their own town.
First, know the characters well. Understand their personalities, likes, and dislikes from the original work. Then, come up with an interesting plot. It could be a new adventure or a different take on an existing event.
It depends on the specific content of 'Smile'. If it's based on real events and facts, it could be nonfiction. But if it's made-up stories and imaginative elements, it's likely fiction.