How to draw a 3D dice

How to draw wood texutes and 3D stuff with mixed media on gray paper. 3D drawing of a wooden dice by Marcello Barenghi http://www.marcellobarenghi.com
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➜ MY DRAWING TOOLS:
mixed media on grey paper, pencil 7B, 9B, B; white chalk pencil; smudge; black and white acrylic http://www.marcellobarenghi.com/p/materials-used-for-my-drawing-video-on.html
➜ FINAL DRAWING: http://www.marcellobarenghi.com/2013/03/amazing-3d-illusion-drawing-wooden-dice_1.html
➜ THIS DRAWING TOOK ME: 1 hour 20 minutes
➜ MUSIC: created in GarageBand

Original title and notes (2013)
Amazing 3D illusion drawing WOODEN DICE
Crazy 3D illusion drawing WOODEN DICE