Pratuang left school to help support his family at the age of fourteen. He took whatever work available, including working as a blacksmith's helper, being a helping hand at the corner coffee store, as well as helping his mother sell sweets and fruits. When he was sixteen, his elder brother, who was a commercial artist, persuaded him to follow in his footsteps. Pratuang then became an apprentice to a commercial artist of a famous advertising company. Having pursed his training determinedly for three years, he was qualified to become an artist. He learned through his experiences to be good at sketching, oil painting as well as applying drawing techniques. Already a competent artist and dedicated worker at the age of nineteen, he was promoted to chief artist. During his employment with the company, he had the opportunity to do a great variety of artistic drawings. Since the company provided advertising service for all kinds of business, the works ranged from scenery to concrete objects for advertisement. Such experience enabled him to appreciate the artistic beauty of basic drawings.

Having been chief artist for two years, despite a stable position and good salary, Pratuang felt an urged to seek a new job. He had stayed a the same company for five years; his work was repetitive, routine, and quite limited. He would like to work in a broader scope where he could experience refreshingly new ideas and improve his abilities more and more. Therefore, in 1954, Pratuang resigned from the company and became a free-lance artist, doing advertising posters for movie theatres in Bangkok. He remained in the entertainment business for eight years during which times his life changed tremendously.

Then was the Golden Age of Hollywood and Thai movies were booming. Creative values of foreign movies contributed in refining the artistic sense of Pratuang who was young and eager to learn. During this eight-year period, Pratuang had seen quite a number of good movies. Exposed to arts of all types: music, literature, painting, performing arts, as well as the underlying philosophy in the movies, he could perceive the meanings of arts to life and his interest for learning grew. He began to attend art exhibitions and musical concerts, as well as read all kinds of books in order to gain more knowledge and open his view to the world. As a result, his knowledge in arts increased. So was his realization that all artistic works helped to develop his thoughts and emotions better than material ones which were favored by the society the. It is possible to say that his long involvement with the movie business amounts to an education in an elementary art institution.