Which artist first made it his artistic practice to omit the preliminary sketch and use premixed pigments?

A) Rodin
B) Toulouse-Latrec
C) Monet
D) Gauguin

Monet, a key figure in the Impressionist movement, was known for his practice of painting en plein air (outdoors) and his innovative approach of omitting preliminary sketches to capture the fleeting effects of light and color directly onto the canvas. This method was part of the broader Impressionist movement's departure from traditional techniques, emphasizing spontaneous, direct application of color.