Some inkers will often do more than simply interpreting the pencil markings into pen and brush strokes; depending on how much detail the penciler puts into the pencil drawings, the inker might add shading or be responsible for the placement of black spaces and shadows in the final drawing. An experienced inker paired with a novice penciler might be responsible for correcting anatomical or other mistakes, modifying facial expressions, or changing or improving the artwork in a variety of other ways. Alternatively, an inker may do the basic layout of the page, give the work to another artist to do more detailed pencil work, and then ink the page himself (as Joe Simon often did when inking Jack Kirby, or when Michael T. Gilbert collaborated with penciller P. Craig Russell on the Elric of Melniboné series).