I have yet to develop a consistent approach to the depiction of a single individual.   Most of the examples here were stimulated by the shape or texture of the raw material.

This bagatelle arose from some scrap strips of aluminum:

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Our chemistry department had scrapped out their old computers and I was able to buy thirty of their 14″ iron-oxide-coated aluminum hard disks.  Bolted together, they made a suitable helmet for the aluminum slab construction portrait of Alex –result: Conquistador.

Here is photo of the slab-sculpture portrait along with a profile of Alex (taken while he was getting his head shaved)

 

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This shows several views of a paper sculpture; an experiment with Bristol board and white glue

 

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This from experimenting with a TIG welder

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This from experimenting with clay over a wooden armature; I was trying to depict my father but ended up rather wide of the mark: