I'm guessing the people who think fantasy is inherently juvenile will mock you for liking a serious troll just as much as they would for liking a whimsical one.I dont need art to say this is childish... or trivial (not worthy of investing effort) ... plenty of critics available for mocking if we need that.
Also, are you equating whimsy with triviality? (asks the guy whose spent many hours detailing whimsy-positive campaign settings)