How to draw silver stuff

How to draw silver stuff with mixed media on gray paper. 3D drawing of a SILVER BELL by Marcello Barenghi http://www.marcellobarenghi.com
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➜ MY DRAWING TOOLS:
mixed media on grey paper, colored pencils, markers, watercolors, acrylic and airbrush. All the art supplies are listed here: http://www.marcellobarenghi.com/p/materials-used-for-my-drawing-video-on.html

➜ FINAL DRAWING: http://www.marcellobarenghi.com/2013/03/silver-bell-drawing.html
➜ THIS DRAWING TOOK ME: 1 hour 14 minutes
➜ MUSIC: created in GarageBand