The dictionary describes whimsical as being imaginative, amusing and unpredictable.
I think every miniaturist fits in this whimsicalness category one way or other. Imagination is a key factor of dreaming up items or entire scenes.
Yes, we are influenced by movies, books and good old-fashioned storytelling, but we still have to figure out how to make it all happen. Displaying hand-created tiny fantasy entourages or authentic time periods are entertaining for everyone to enjoy.