How to draw a 3D ice cream cone

How to do 3D drawings with mixed media on gray paper. 3D illustration by Marcello Barenghi http://www.marcellobarenghi.com
Final picture: http://www.marcellobarenghi.com/2013/05/drawing-ice-cream-cone.html
Materials used: http://www.marcellobarenghi.com/p/materials-used-for-my-drawing-video-on.html
Music: "Beautiful Straight Lines" by Dan-O at http://danosongs.com ("Package" Licence)
It took me 2 hours and 22 minutes