I think Jonathan Jones gets it profoundly wrong when he describes what makes Elliott Erwitt's heart-wrenching historic photo the truly great moment-capture that it is. (Click here for his critique in The Guardian, or see the extract below.) It's not Jackie's veiled grief-stricken face offset by the decorated soldier behind her, nor is it Bobby's little-boy-lost faraway look... The powerfulness in Erwitt's image lies in that desolate, focus-less chasm between JFK's beloved significant pair – starkly showing us the space he once held.
I'm no art critic by any stretch but Jones, IMHO, really is pants at critiquing photography. And why he thought it useful to compare this photograph to Warhol's Jackie screenprints is a mystery to me...