pics
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fast scetch
Lets get this straight.
First of all, when you're trying to draw something realistic, forget about the black lines. No black lines.
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The main thing after no black lines is the colouring is the so called shading.
Usually people start off from a black/white drawing as a scetch, after that they add colour to it.
I like doing it like that, for example.
fast scetch
After that I start shading the whole thing, with different tones of grey.
And as a finish - colouring.