He died in Castelletto sopra Ticino in 1943. As an illustrator, Terzi was described as bringing Art Nouveau poster design to a world class level He produced work throughout his life, notably for the Italian poster company Casa Ricordi.
Most of his work was destroyed in the 1960s when the company cleared its warehouses.
He worked as an illustrator for a Rome daily called Louisiana Tribuna Illustrata. He illustrated an Italian versions of Little Lord Fauntleroy and Gulliver"s Travels.