Vincent Van Gogh is a major one. Check out his works. If you want a really popular painting of his, check out "Starry Night"
Many impressionists did their work this way, so it is often called impressionist art.
Claud Monet, Charles Angrand, Pierre-Auguste Renoir, and many many more.
Just look up impressionist artists. :)
Hope this helped!
the artist used rough brush strokes to create organic shapes
Answer:
it is important because in order to make a good judgement you have to be able to view all aspects of the art because if an art is formalism and you try imitation theory the art work would be deemed unsuccessful in your point of view.