Drawing Hole Illusion - Trick Art with Charcoal Pencil - Vamos

Drawing Hole Illusion. Trick Art with Charcoal Pencil. Vamos.
How to draw 3D Hole. Drawing hole in diagonal checkered pattern.
Material used:
Paper: A/4, grey.(Fabriano Elle Erre 220 g.)
STABILO graphite pencil HB.
Charcoal pencil.
White pastel pencil.
STABILO Pen 68.
Plastic rulers.
By Sandor Vamos. I'm Hungarian.
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