The Roses of Heliogabalus (1888) by Lawrence Alma-Tadema.
The full context for what you're looking at: according to the Historia Augusta1, the emperor Heliogabalus once had flower petals poured on some of his dinner guests until they were smothered to death. I feel like in this depiction, that fucker knows exactly what they're doing.
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This source is notoriously unreliable and may have been intended as a parody of historical texts, sort of an ancient version of 1066 and All That, so take the historical veracity of this story with a massive grain of salt.