The correct statements about the artworks of John Sloan are:
- Critics believed the artwork belonged in an ash can and gave Sloan's group the nickname Ashcan School.
- They frequently show life in the city.
- They are done in the style of Realism, showing life as he saw it rather than in an ideal way.
The statement regarding their brushwork being very controlled and polished is not accurate, as the Ashcan School's style typically emphasized a more spontaneous and expressive approach rather than a polished one.