Dunno about the original contract but I do recall when I hired an ad agency to produce a magazine ad we got into hot water when we subsequently tried to use the image for additional purposes such as display / showcards. Cost us a lot of wonga because we hadn't realised that the photo was still the property of the photographer and we only had permission to use it for the specific ads. Could be that if "your" publisher re-uses your image in other ways, posters etc. you might have a case.
I reckon you need a friendly lawyer with a bit of spare time.....
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