I'd pick Da Vinci, so I'd have a chance to find out why a "key student" painted a better Mona Lisa.
From wiki: "...based on analysis obtained after the picture underwent extensive restoration, that the painting is probably by Salaì (1480-1524) or by Melzi (1493-1572)."
Giaconda:
But but but... the post says: "anyone alive". Da vinci is not alive :c
Unless that...
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:O #Illuminati
OK, you got me there...er, this is all I got: