They can file a DMCA takedown complaint against you, which can result in all your content being deplatformed and/or demonetized.
They can sue you for damages. In the US, statutory damages for regular copyright infringement are $750 - $35,000 per infringing act. Each use of each stolen image is a separate infringing act. If they can prove your infringement was willful — for instance if you removed copyright notices — statutory damages can go up to $150,000 per infringing act.
If your infringement was willful and was for financial gain or business advantage, you can be charged with criminal copyright infringement. The penalty for criminal copyright infringement in the US is up to 10 years imprisonment and up to a $250,000 fine per infringing act, in addition to civil damages.
Using a copyrighted image without permission may lead to legal consequences, including fines, lawsuits, or takedown notices. The copyright owner can demand removal, claim damages, or enforce penalties under copyright laws, depending on the jurisdiction and extent of infringement.
No se puede utilizar lo ajeno, salvo consentimiento expreso. En ese escenario, se requiere contar con una autorización del titular mediante un acuerdo o instrumento público que lo contenga, de otro modo, la repercusión legal es ser emplazado con una acción indemnizatoria de caracter patrimonial y moral, dependiendo de la legislación se podrá considerar invocable y aplicable algunas medidas cautelares como el cese de uso definitivo o temporal (hasta regularizar las regalías).