In the 1950's, he began showing the art of photography, silk screening, sculpture, film, and music. His style was to show objects and relating them to advertisement. By the beginning of the 1960s, Warhol had become a very successful commercial illustrator. His usage of typography and many different sources of art greatly made him known world-wide.
I think that Andy's work is great, however his style doesn't match mine because it is not that artistic. I would say that he should make more pleasure in the paintings instead of making it a plain objects. However the usage of advertisement and celebrity art is very smart.
Source: http://en.wikipedia.org/wiki/Andy_Warhol