Why did Fernando Botero paint Mona Lisa at age 12?

Originally Fernando Botero didn't set himself to paint a young Mona Lisa. He had painted a Colombian girl (aged 12). While he was living in New York City in the early sixties, the woman that cleaned Botero's apartment saw the painting and told him that it resembled the Mona Lisa. Botero picked-up on that comment, modified the painting and renamed it, Mona Lisa,age 12