Purple is such a great color to use if you're trying to express exquisite artistry... or vanity. It sure can be a double-edged sword, but I think it was used to its advantage in this ad for an opera. While the purple here is mainly meant to convey the artistry, it also subtly alludes to the diva-attitude that some opera singers have been known to have.
I also particularly like the paint-like texture of this piece; it also adds to the artistic effect.