Drawing a cool backpack - How to draw 3D Art

Beware of the backpack! 3D drawing by Marcello Barenghi http://www.marcellobarenghi.com
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➜ FINAL DRAWING: http://www.marcellobarenghi.com/2016/06/bastardidentro-backpack-drawing.html
➜ MY TOOLS: http://www.marcellobarenghi.com/p/materials-used-for-my-drawing-video-on.html
➜ THIS DRAWING TOOK ME: 4 hours 21 minutes

➜ MUSIC: "Country Fried" from YouTube Audio Library https://www.youtube.com/audiolibrary/music