How to draw the leather

How to draw a 3D leather volleyball with mixed media on gray paper. 3D realistic drawing by Marcello Barenghi http://www.marcellobarenghi.com

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MUSIC:
"Today Then Tomorrow" by Dan-O at http://danosongs.com ("Package" Licence)
http://www.danosongs.com/music..../danosongs.com-today

FINAL PICTURE:
http://www.marcellobarenghi.com/2013/04/leather-volley-ball-realistic-drawing.html

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

THIS DRAWING TOOK ME:
3 hours

Leather volleyball realistic drawing by Marcello Barenghi - Italian Art