PCB designing is an art as well as a science. This is science is for very obvious reasons as electronics is essentially one the most important fields of science. One really needs lots of knowledge of Physics and Electronics to make the components populated on a PCB operate properly. But art plays a role in the look and feel of PCB as well as that of the overall product.
PCB Design and Art work is made on one of the most versatile software circuitmaker, drawings, semantic diagram, pcb samples etc.