I agree with the arrested action in general, but I'm thinking of a piece by Sargeant portraying a famous writer, who was in constant motion, pacing the floor. And that is the way he portrays him, and - it works.
I think a portrait should reflect the personality of the sitter. There are exceptions to almost every "rule".
For example, If a person smiles frequently in a broad toothy grin, and it is the most true reflection of their personality, then anything else may strike a false note to those that know them.
A commercial piece is always a balance between what the ones paying want and what the artist recommends.
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