Pekka Halonen is not usually considered as an art reformer, but he was one of the first Finnish artists who began to experiment with color painting. He moved to a brighter and cleaner color palette which he introduced gradually in the 1900s. This reached its peak in the 1910s , when his art could be called a revelry of pure primary color color. “Tomaatteja” (Tomatoes) is a classic example. Also as a note of interest, Pekka Halonen’s work may have had an influence on Canada’s “Group of Seven” landscape painters: MacDonald and Harris visited an exhibition of modern Scandinavian art at the Albright Gallery in Buffalo, New York in January 1913 and were inspired by the modern interpretations of landscape art. They especially were enthusiastic that Northern painters were painting the North. Others they admired included Otto Hesselbom and Gustav Fjaestad.
(http://www.alternativefinland.com/art-pekka-halonen/)