Elmore Leonard's punchy style and compelling characters has Hollywood continually coming back to his work. Some of the many adaptations of his writing are highlighted in this post.
Give your readers the equation, but let them do the math. It's more fulfilling, and keeps your reader engaged, when you let your story's subtext reveal itself.
My mission was to list films that aren't the obvious "go to" movies in a "best book to film adaptation" compilation.
Creating a believable character for your story begins with an initial idea, but the process of developing her into a complex, real personality will require thought and research.