(FORTUNE Magazine) - For Erin Crowe, Alan Greenspan isn't just the outgoing Fed chairman. He's her muse. Once the 25-year-old started painting his nuanced expressions while on a fellowship, she was hooked. "People's reactions were so wonderful," she says. After a wildly successful show last summer, she painted 36 more portraits for a "Goodbye, Greenspan" exhibit. At the recent opening in New York, hedge fund types bought 20 for up to $6,000 per canvas. Like her subject, Crowe now says it's time for her to move on: "He's retiring. I won't see his pictures anymore. I won't be tempted."