Guess Who Painted This?

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I've been drooling over the stylish sets and fashion featured in BuzzSugar's Mad Men Season Three, In All Its Finery post. This photo, from Buzz's post, features a new piece of artwork in the office (on the far right of this photo). While I doubt it's actually an original, which famous artist is this painting paying tribute to?

Guess Who Painted This?

Guess WhoArtMad Men
Name This Flower
Name This Flower
Name This Flower
Name This Flower