Research about two artists who exemplify mastery of detailed drawing

Modern - I came across the work of Spanish born artist Juan Francisco Cases.  Still a young artist but very accomplished.  His 'photo-like' drawings done only using a blue Bic pen are amazing and on close inspection you can see he uses the hatching technique with an extremely light touch, building up layer upon layer.   See below :




WILLIAM BARTRAM (1739-1823)

An American naturalist drawing botanical and ornithological subjects.  Bartram was born in Pennsylvania and as a boy accompanied his father (a renowned botanist) on many of his travels.  From his mid teens, Bartram was noted for the quality of his botanic and ornithological drawings. He himself undertook extensive travelling expeditions to draw and make notes on native flora and fauna. In the late 1780s he completed the book for which he became most famous Travels through North and South Carolina, Georgia, East and West Florida, the Cherokee Country etc.  It was considered at the time to be one of hte formost books on American natural history.
Source: Wikipedia

This is one image of a drawing by Bartram that shows use of mark-making to give tone and form.  Lines, stippling, different types of marks to depict different areas of plant.  Very deliberate marks and work on achieving the correct tone.