What is the most important school of photographic art?

Photographic art since its birth only 100 years of history, it is developing rapidly, in countries around the world appeared a variety of different styles and schools, the most important of which are: pictorialism photography, from the mid-19th century originated in the United Kingdom, and soon spread around the world, becoming the earliest formation of the history of the photographic arts, the most extensive impact of a school, the creation of this school of pursuing the effect of the paintings, the works of art from the forms of This school pursues the effect of painting in its creation, and the form of works from the composition and layout to the use of light and shadow have very strict laws, which was popular for a while.