Holroyd made his chief reputation as an etcher of exceptional ability, combining strength with delicacy, and a profound technical knowledge of the art. Among the best known are the Monte Oliveto series, the Icarus series, the Monte Subasio series, and the Eve series, together with the plates, The Flight into Egypt, The Prodigal Son, A Barn on Tadworth Common (etched in the open air), and The Storm. His etched heads of Professor Legros, Lord Courtney and Night, are admirable alike in knowledge and in likeness. His principal dry-point is The Bather.