The main purpose of artists studying the human body is to

The main purpose of artists studying the human body is to capture and apply one of the most complex structures or forms known to man. The human body is said to be so complex because it is one form that can further be divided into many other smaller forms. Some say that knowledge of the human form can be an invaluable tool for artists because it teaches them subtlety, skills, accuracy, understanding, etc.

  paul cezanne's paintings inspired picasso to experiment with perspectives and begin cubism with george braque.hope this  

For example you could start a retail clothing store because you would need to have skills in business and you could start an photography business you would need to have skills in photography. hope this