When you think of tragic opera heroines, you think Aida, Tosca, Madame Butterfly, La Traviata, but Anna Nicole? Actually, come to think of it, what would a good opera be without a buxom, morally compromised woman, which is exactly what composer Mark-Anthony Turnage and librettist Richard Thomas saw in Ms. Nicole's tragic story. Their opera, already a smash in London, comes to The Brooklyn Academy of Music next week. The question is: Will it live up to another contemporary drug overdose set to music, Mr. G's masterpiece, "Annabelle Dickson: The Musical"?