Retro style onomatopoeia in pop-art form, use of this theme is abundant in old comic books. Although childish, the "sound-words' create a playful image and a way to visualise the sound in an otherwise silent environment.
"Though this picture is simple. I have done black and white photography for many years and my favorite element of design is contrast. The contrast in this photo takes it from simple to interesting." I think this a fine example of contrast/black and white.