This post includes a variety of stages in adding color and texture to inked art.  I penciled and inked the artwork by hand, photographed it, and worked the rest of the way in Photoshop.  

original inked drawing
raw colors

texture overlays
beneath the lines

adding shadow and glow effects

Final Artwork: dark sky option
Final Artwork: light sky option
See more artwork from Jason Jaspersen at jjjaspersen.com, and on social networks such as Facebook, Twitter, and LinkedIn.