premise: A smiling girl walks through a flurry of leaves falling in a forest. hypothesis: A happy girl is hiking and enjoying the fall colors.
neutral: Smiling does not always signify a happy emotion, particularly when associated with some disabilities.  Hiking is not the only way to walk through the woods. The emotion of the smiling girl may not involve enjoying her present location.  Leaves do not always fall during the season of fall and not always because the leaves have changed colors.