A little boy in a black and red striped shirt walks down a grassy hill.
The boy in black and red is walking down the beach.
The boy is either walking down a beach or a grassy hill.
He refers to a grassy hill, not a beach.
little boy, and grassy hill refers to a specific size or age, grassy hill," is a geographic state of depth and existing foliage, while boy is vague  a beach is flat and barren of foliage.