Regarding speed, ya know, I don't really hurry. I just make each line count. I call it, "one shot drawing." Each line is final, and you just go through the procedure very methodically. And with the sanded lead, I can cover ten times the space in the same time as someone who uses a fine point.
I draw using what I call "line first" method (kind of my mantra). I focus on each line, and let the form take care of itself. If each line is correct, the drawing will be correct. Of course, I have a procedure which I stick to. It is the polar opposite of the methods taught in most classes I have heard about where you are told to not worry about the lines, just scribble your way to the end.
You learn what really is essential to a portrait when you work in this short time frame.
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