Create a stunning oil painting of a flock of birds in flight with a woman looking up at them with a clear, joyful expression on her face. The scene should be set against a vast open sky with soft natural lighting, capturing the beauty and grace of the birds' movement. The painting should be rendered in a style reminiscent of John James Audubon's bird illustrations and Mary Cassatt's impressionistic portraits, with a color scheme dominated by shades of blue, green, and white. The focus should be on capturing the fine details of the birds' feathers and the woman's expression, in high resolution.