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Thanks mate! It's simple- imagine the basic 3-dimensional shape, do really fine outlines with pencil H graphite does the work. and then point where the light is coming from. everything else is patience.
Cheers!

thank you very much for information....I have to work harder to do it properly ... I should study them... :)

Just look at the work of Allen Williams he does it with perfection. You might understand the process better :)

now I look at him willingly.....there is always something to learn

Take your time mate. Happy grinding!
Cheers!