This is an interesting problem, and as usual, there are no easy "set rules" to follow . . . sometimes photographic "frozen motion" conveys less activity visually than quieter, more subtle suggestions do.
Richard, what came to my mind reading your post was the portrait Robert Liberace presented at the PSOA conference last May, of Nat'l Portrait Gallery director Marc Pachter . . . Sargent also used variations of those "cartoon" motion lines in some of his backgrounds. I hope you'll show us your work in progress! (sounds great!)
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