Learning from the Masters: Tom Jones
Master's copies are a time-honored tradition in artistic training. Copying another's work is useful because replicating a piece forces you to study the minutiae of its execution: how the artist created a sense of texture or subtly shifted value to communicate volume.
Below is my copy of a Tom Jones illustration showing the blood supply of the thyroid, followed by his original. In addition to being a master of medical illustration, Tom Jones also founded the Biomedical Visualization program at UIC in 1921 with the vision to train "artist scientists" -- like me, almost a century later.