Pictorialism is coined from the word "picture impressionism". Pictorialism started in the late nineteenth century, around the time impressionism was gaining popularity. Here is a typical example. The grainy effect simulates the rough brush strokes of an impressionist painting.
Modern digital camera makes it possible to create photographs that emulate an impressionist painting in colour, as shown in this beautiful example.
Some photographers venture into the realm of extensive digital manipulation to emulate the impressionist style of the great masters.
Others produce abstract work under the umbrella of impressionism.
Here is my work with a camera. The only photoshop work on this picture is cropping. Hopefully you noticed the background more than the flowers. This picture is about how the background emulates what you see in an impressionist painting.