Three Musicians is a perfect example of Picasso's Cubist style. In Cubism, the subject of the artwork is transformed into a sequence of planes, lines, and arcs. Cubism has been described as an intellectual style because the artists analyzed the shapes of their subjects and reinvented them on the canvas. The viewer must reconstruct the subject and space of the work by comparing the different shapes and forms to determine what each one represents. Through this process, the viewer participates with the artist in making the artwork make sense.
Source: PabloPicasso.org
The dessert: harmony in red (The red room), 1908, is considered by some art historians to be Matisse's masterpiece. Matisse developed his style using areas of flat, brilliant and often unnatural colour and invariably outlined his forms in a manner similar to Van Gogh. This fauvist painting has no central focal point. The painting initially was ordered as 'Harmony in Blue,' but Matisse was dissatisfied with the result, so he painted it over with his preferred red.
Source: HenriMatisse.org
Van Gogh’s paintings of Sunflowers are among his most famous. He did them in Arles, in the south of France, in 1888 and 1889. Vincent painted a total of five large canvases with sunflowers in a vase, with three shades of yellow ‘and nothing else’. In this way, he demonstrated that it was possible to create an image with numerous variations of a single colour, without any loss of eloquence.
Source: VanGoghmuseum.nl