BLACK AND GREY TECHNIQUES

I WAS HOPING THAT ANYONE WILLING WOULD SPEAK ON THIER PREFERENCE TO RENDERING SMOOTH BLACK AND GREY WORK. SUCH AS VALUE VARIATION AND NEEDLE DEPTH… SPEED OF THIER MACHINES… COIL VS. ROTARY AND BACK AND FORTH STROKES AS OPPOSED TO FASTER TIGHT CIRCULAR MOTION. I PREFER TO HAVE A HIGHR SPEED ON MY MACHINES WITH SHORT NEEDLE STROKE ESPECIALLY FOR PORTRAITS. WHAT ARE SOME OF YOUR TECHNIQUES FOR THAT GRADIENT SHADE AND MULTI TONE BLACK AND GREY

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