maiden work; debut work; first work
Refers to the first published or publicly presented work by an author, artist, filmmaker, etc. Often used in literary and artistic contexts.
His debut work was published when he was 20.
This novel is her maiden work.
Compound of 処女 (shojo, 'virgin; maiden') and 作 (saku, 'work; production'), literally 'maiden work'. The term uses the metaphor of a first experience to denote an artist's or author's first creation.