D.O'K.
Darren O'Keeffe.
If at the time of the contract you agreed that the images would be used for the sort of advertising he's gone on to use them for it's hard to see how he's breached your copyright. Rather, your remedy would be payment of the fee (always assuming it was also agreed you would be paid).
His reason for not paying--that the images are "not good enough"--is however plainly bunkum given he's used them for the purpose comtemplated at the time of the contract.
So if you can't negotiate a compromise (which is excellent advice, the due process of law being slow and hardly ever certain) the best way forward is to threaten proceedings for non-payment of the agreed fee, not for breach of copyright.
Regards,
D.
His reason for not paying--that the images are "not good enough"--is however plainly bunkum given he's used them for the purpose comtemplated at the time of the contract.
So if you can't negotiate a compromise (which is excellent advice, the due process of law being slow and hardly ever certain) the best way forward is to threaten proceedings for non-payment of the agreed fee, not for breach of copyright.
Regards,
D.