For "quiet," I chose to draw a lone spaceman in outer space, standing on maybe Moon, looking at Earth. There maybe white noise or some sort of noise, but my impression of outer space is an eerie quietness. Weightless and airless, it maybe more like stepping in a sound vacumn like standing still underwater, where humming in your own head sounds weird.
In retrospect, I could have also drawn Earth in the vast open space of our Galaxy or even of the whole Universe. But, maybe that would've come across more as "ALONE" rather then "QUIET."