The prices Mr. Bergès has said he is seeking for Mr. Biden’s works — between $75,000 for works on paper and up to $500,000 for large-scale works — are high for a new artist, even one with a well-known name, several art experts said.

“It’s an eyebrow raiser,” said Cristin Tierney, a New York gallerist. “I have artists who have very real careers who might not sell that much in dollar terms cumulatively over 10 years.”…

“I don’t think there has been any discussion in the market at all about Hunter Biden — he doesn’t seem to be on the radar of any collectors or market makers or specialists I’ve been speaking to,” said Edward Dolman, the chief executive of Phillips auction house. “There is some value in celebrity, but at the end of the day, the quality of the art tends to dictate how the market relates to it.”…

“It’s sort of insulting to the art ecosystem, as if anyone could do it,” Lisa Schiff, a New York art adviser, said of the Biden example.