The line drawing/wireframe has been done, using -one or more- techniques for skipping doing the line-drawing from scratch, thus getting accurate likeness in drawings of people without much erasing.
Therefore, NO drawing skills were used/needed for getting correct size, proportion, nor perspective at the initial basic stage.
ONLY the tone-value/rendering stages of these drawings have been done in a Freehand fashion, for which I can honestly take credit for.
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