How to use "giants" in a sentence

I am scared now because I know that I am near, and in the dark I begin to see large, grey stones standing like giants on the top of the hill

"Yes," a voice replies, "and this is where it ends." And a tall man steps from behind one of the silent giants.

Meanwhile, the sky grew darker by the second; massive storm clouds, like the clenched fists of celestial giants, squeezed the last light out of the day