The comparison with your own childish vs adult drawings is simply off the mark. A more similar comparison could be provided by how artists depict the Vikings. It is well known today that the helmet with bull horns is made-up, and was probably never used by actual Vikings. Yet tons of people still portray them with such helmets, and most non-artists still have that same association in their minds. Why? Because a child growing up and developing their observational and artistic skills is not the same as a culture with its century-old symbols and images.
Admittedly the depictions of Jesus in art today are frequently done by more or less amateurish artists and are meant to be traditional in their style, which additionally makes them less likely to move away from the inherited imagery.
The comparison with your own childish vs adult drawings is simply off the mark. A more similar comparison could be provided by how artists depict the Vikings. It is well known today that the helmet with bull horns is made-up, and was probably never used by actual Vikings. Yet tons of people still portray them with such helmets, and most non-artists still have that same association in their minds. Why? Because a child growing up and developing their observational and artistic skills is not the same as a culture with its century-old symbols and images.
Admittedly the depictions of Jesus in art today are frequently done by more or less amateurish artists and are meant to be traditional in their style, which additionally makes them less likely to move away from the inherited imagery.