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Yes, you need an attorney. Copyright infringement is literally a "federal case" -- it must be filed and heard in U.S. District Court.
The first prerequisite the judge will consider is whether or not the work in question was registered with the U.S. Copyright Office prior to the time the alleged infringement occurred. If it wasn't, it a pretty safe bet that the case will not be heard (i.e., you're out of luck).
If the case is heard, you'll be required to prove that the other party had access to the copyrighted image (which seems easy enough if they signed a license agreement), and that they are using that copyrighted image (or one substantially similar to it) without permission or compensation. "Substantially similar" can be tricky, but the courts have a variety of "tests" that apply, and an intellectual property attorney will know all that.
If the court rules in your favor, remedies may include an injunction against any further unlicensed use of the image, the impound and disposition of products already in existence on which the image is used, and various criminal and civil penalties. Again, a qualified attorney will know how to quantify and present your damages.
Hope that helps. Good luck!