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Excellent point, Michele. If the portrait really has no marketing potential beyond its initial sale to the client, then it isn't as important to retain the copyright. In that case - you could say something like - an additional 50% of the original fee to purchase all rights - but the artist retains the right to display images of the artwork for portfolio/presentation purposes.
Chris is exactly right - you can sell whatever portion or duration of the copyright you wish to.
(Except that this is only what I know of US copyright law.)
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