His work is defined by the mezzotint process, a technique often called the 'black manner' due to its ability to produce deep, velvety tones. This method involves roughening a copper plate with a tool called a rocker to create a surface that holds a large amount of ink. Faber then scraped away the burr to create lighter areas, allowing for a range of grey tones and soft highlights. This approach was ideal for capturing the textures of eighteenth-century fashion, from the sheen of silk waistcoats to the powdered surfaces of formal wigs.

Modern collectors value these prints for their clean compositions and historical clarity. The works avoid the excessive ornamentation often found in other Rococo prints, focusing instead on the poise and personality of the subject. These engravings function well in contemporary homes because they provide a sense of structure and tradition without overwhelming a room with colour. Faber's ability to balance technical precision with a direct, honest portrayal of his sitters ensures his portraits remain relevant for those seeking classic art with a clear historical narrative.