Thanks. 
To be honest I usually draw sitting in a sofa/armchair or halflying in bed, paper on one side of the book I'm drawing from or drawing in sketchbook. Not the best posture for drawing
Thanks for pointing it out though, will try to think about it - especially if it's a "serious" drawing.
"Every child is an artist. The problem is how to remain an artist once he grows up." - Picasso
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