The final show art, from the advertising agency Serino Coyne, is an icy fantasia by Olly Moss, an artist based outside London. The poster features a giant, stylized snowflake with brushy tips that bursts across a sea of azures and indigos. Embedded in the fractal geometrics are silhouettes of a young woman reaching with a dramatically raised arm. For added wow, negative space forms two other likenesses that, as Mr. Flatt noted, people might not see right away.

Image Detail of silhouettes in the new poster for “Frozen.” Credit... Serino Coyne

“A lot of audiences enjoy a secondary reveal,” said Mr. Moss, who is known for creating alternative posters for old movies and is making his debut as a Broadway poster designer here. “It’s almost like a magic trick.” (Do you see the other silhouettes yet?)

Mr. Flatt said that Mr. Moss’s poster got the nod because it was “elegant and confident and special, and also truly unique to ‘Frozen.’ ”

Mr. Flatt recently talked about seven other concepts he considered, drawn from a blizzard of over 100 submitted by Serino Coyne.

His comments have been edited and condensed.