I think it would be a loss to omit the arm. The gesture seems to me keenly descriptive of character. It won't be a cinch to capture it "just so", but if you pay close attention to edges (such as all the lost edges of the sleeve against the background of light) and values (essential to tackling the foreshortening in the arm), I think it would be very effective. There's a "story" in that arm that seems to want to be told.
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