I need more facts .Do u have an agent? You have previous shootings with other photographers?
Do you have a portfolio ?this is your first portfolio? Where the photographer is located,his previous jobs? Did you try to check with the site you posted? This and much more .
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I would try to resolve this matter informally at first. Contact the photographer and remind him of your agreement. Let him know that you fulfilled your promises under the contract and that he should do the same. Document all of your attempts to contact him informally (only do it through a letter or at least an email, not over the phone or verbally in person).
If he still does not uphold his end of the bargain, you should hire an attorney and sue him for breach of contract.
I handle this type of work.