Tracing to crack the code- Neal Adams

was listing to interview with Neal Adams on Kevin Smith's Smodcast: Fatman on Batman and was inspired to learn many professionals use reference and maybe even tracing to increase there speed to complete artwork and  their production quality in some cases. Looking at Neal's stuff, I see a lot of reference but also an eye for art being exercised.. Noting he knows how to render shapes with a line and indicate depth like no other- so I am going back to school and tracing over his stuff to help me see how he sees in defining  and rendering his shapes- so I used sketchbook pro to produce this inking trace- I learn a lot about how he renders hair and volume.... more to come...