Le déjeuner sur l'herbe (luncheon on the grass), by was considered scandalous because of its loose brushwork and depiction of ordinary subjects.

I believe the answer is edouard manet.
Edouard Manet was a french painter that was known for pivotal figure in the transition from Realism to Impressionism.
Due to many of his bold approach in painting techniques, he is regarded as one of the first 19th-century artists to paint modern life.