His technique relied on the use of brown ink and grey wash over pencil. This method allowed for clear definition in his plates. This approach was necessary for his contributions to the Neoclassical movement, particularly his engravings for the catalogue of antiquities from Herculaneum. Morghen worked to translate the three-dimensional quality of ancient sculptures and frescoes into two-dimensional prints. He avoided the excessive ornamentation common in Baroque styles. He preferred the clean lines and balanced compositions that defined the Enlightenment era.

Modern collectors value these prints for their architectural clarity and historical accuracy. The works function as windows into the 18th-century interest in the classical world. Because Morghen focused on documenting specific artefacts, his prints possess an academic quality that suits minimalist interiors. They offer a sense of order and intellectual curiosity. His etchings of Neapolitan scenes and ancient relics remain popular for those who appreciate the intersection of art and archaeology.