Pierre-Auguste Renoir, Standing Bather, c.1885; The Clark Institute.
This is one of several paintings and drawings by Renoir called "Standing Bather," many of which are similar in composition and execution. The purple version of this painting, seen below, has appeared regularly online. It's clearly a newly-minted interpretation with an imaginative color scheme. I don't know much about the origin of the contemporary copy, but the museum's photo is definitely the better choice.
Altered version of a painting by Renoir.
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