Here are some key factors:
* His bold use of color and dynamic compositions: Neiman's paintings captured the energy and excitement of the events he portrayed, which resonated with audiences.
* His choice of subjects: His focus on popular sports and entertainment figures, like Ali, made his work relatable and appealing to a wide audience.
* His commercial success: Neiman's work was reproduced on a large scale, appearing on everything from posters to clothing to stamps, further solidifying his popularity and recognition.
While there isn't one specific painting that made him famous, his consistent use of bold style and his portrayal of iconic figures across a multitude of his works ultimately led to his lasting legacy as a renowned artist.