National Portrait Gallery/AP The nation just can't get enough of blue dresses, can it? No sooner had the furore over a blue-and-black dress (or is it gold and white?) subsided than painter Nelson Shanks sparked his own kerfuffle in an interview with the Philadelphia Daily News. Asked if any commissions had been particularly challenging, the veteran celebrity portraitist—he also painted Ronald Reagan and Princess Diana, among others—named his presidential portrait of Bill Clinton: Clinton was hard.