Is it soft and fuzzy? Sharp and distinct?
Bright and colorful? Grayed and subdued?
Flat and straightforward? Nuanced and shaded?
Flowing and flexible? Stiff and rigid?
Plain and unadorned? Complex and detailed?
Amorphous and misty? Definite and clear?
The illustrator absorbs the manuscript's essence through his pores, and then allows that essence to flow out through his fingers onto the page.