The metal skull - 3D illusion drawing

This timelapse video shows how I draw a metal skull pendant
http://www.marcellobarenghi.com
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FINAL PICTURE:
http://www.marcellobarenghi.com/2013/02/the-metal-skull.html

DRAWING TOOLS:
http://www.marcellobarenghi.com/p/materials-used-for-my-drawing-video-on.html

THIS DRAWING TOOK ME:

Music: created in GarageBand