To be honest, I've never seen this van Gogh before. At the end of 1889, Van Gogh painted three versions of this picture, this one at the Metropolitan Museum of Art in New York; one in the National Gallery of Art in Washington, D.C.; and one in B. & E. Goulandris Foundation in Athens.
Vincent himself described the first as a study from nature "more colored with more solemn tones" (private collection) and the second as a studio rendition in a "very discreet range" of colors (National Gallery of Art, Washington, D.C.). The present work, the most resolved and stylized of the three, was intended for his sister and mother, to whom Van Gogh wrote: "I hope that the painting of the women in the olive trees will be a little to your taste—I sent [a] drawing of it to Gauguin, . . . and he thought it good. . . ."
Vincent van Gogh painted at least 15 paintings of olive trees, mostly in Saint-Rémy-de-Provence in 1889. At his own request, he lived at an asylum there from May 1889 through May 1890 painting the gardens of the asylum and, when he had permission to venture outside its walls, nearby olive trees, cypresses, and wheat fields. The olive tree paintings had special significance for van Gogh. His paintings of olive pickers demonstrate the relationship between man and nature by depicting one of the cycles of life, harvesting, or death. It is also an example of how individuals, through interaction with nature, can connect with the divine.
P.S. Vincent van Gogh was fascinated by other artists' works and he copied them quite often. See how it worked out here!