A boy wearing a yellow shirt, khaki pants, and blue and yellow shoes is hitting a tennis ball off a wall with a tennis racket.
A child in a colorful outfit, holds a piece of sporting equipment and uses it to propel an orb against a vertical surface.
A boy is a child. Blue, khaki, and yellow are colorful outfit.   A tennis racket is an sporting equipment. A tennis ball has an orb shape.   A wall is a vertical surface.
The boy is wearing a variety of colors (which can be described as colorful) as he hits a tennis ball (the orb) off of a wall  (the vertical surface) with a tennis racket (the sporting equipment).
A boy (child) in colorful outfit (yellow shirt, khaki pants, blue and yellow shoes) holds a piece of sporting equipment (tennis ball), and uses it to propel (hitting) an orb (ball) against a vertical surface (tennis racket).