When the twin destroyed that painting, she became the villain of the movie.
Or launch an unsafe product for the general public?
I was sorta expecting that they would point out that Miles was himself taken in by the Louvre, and given a museum shop print. But it doesn't work with the film's final gag, so I guess it's just an error.
Ah, well. I don't take mystery movies too seriously for just that reason. It was fun and I enjoyed it.