Mystery Artist: Water Lilies

Can you name the artist who painted these water lilies? I'll send a deluxe Dinotopia map to the first person who guesses the correct answer.
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Addendum: Zelas correctly identified the Russian painter Isaac Levitan (1860-1900). The painting is 95cm x 128cm and was painted in 1895, before Claude Monet's famous water lily paintings.

More samples of Levitan at Athaeneum.org/Levitan and Wikipedia/Levitan