How to use "fists" in a sentence

Unable to control himself, he beat his fists against the walls of the house.

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

She sat straight up, the sheets knotted in her fists, catapulted out of a nightmare

Her hands, which had been curled into tight fists, came open once more