How to draw iron and rust

How to draw a medieval iron helmet with mixed media on gray paper. 3D realistic illustration by Marcello Barenghi http://www.marcellobarenghi.com

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FINAL PICTURE:
http://www.marcellobarenghi.com/2013/04/drawing-medieval-helm.html

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

THIS DRAWING TOOK ME:
3 hours and 5 minutes

Realistic medieval helmet, drawing by Marcello Barenghi - Italian Art