Drawing my blue dumbbell 3D Art

How to draw realistically a dumbbell full drawing process (time lapse video).
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(Standard Licence)
➜ THIS DRAWING TOOK ME: 3 hours and 14 minutes
➜ FINAL PICTURE: http://www.marcellobarenghi.co....m/2015/10/drawing-my

Mixed media (colored pencils, markers, ecoline, airbrush...) on gray paper by Marcello Barenghi.
This is one of my dumbbells. I'm using it every evening and I'm so fascinated by reflections on its blue vinyl coating :)