Richard Hewett provides another part to his series showing some of the techniques he used on creating his realistic portrait of Ben Kingsley. Here, Richard shows building the specular maps for the portrait.

A series of videos, documenting and explainng the process Richard Hewett went through to create this portrait

Part 1 of Creating Ben Kingsley shows the workflow for creating the maps needed from ZBrush. Richard goes over creating and editing the maps that are built from ZBrush. Check out Creating Ben Kingsley Part 1 (Creating maps from Zbrush) here if you have missed it previously.