I've got it!
Li Shi felt a surge of impulse in his heart. He promptly returned to his drawing board, picked up a pencil, and began to draw without hesitation.
It was the first time he was drawing two female models, and they were identical twins at that. He sketched the composition effortlessly, slowing down only when it came time to delineate the details, quite some time into the drawing.
Fifteen minutes later, he raised his head and whispered to the two sisters, "You can relax a little now."
After speaking, he quickly went back to his drawing.
He was in a rather unusual state of "rational excitement" at that moment, each stroke a careful application of the image he had imagined in his mind, adding the details of the two figures.
Another ten minutes passed, and Li Shi looked up again, "Now you can relax even more, it's fine if you want to use your phone."
He continued drawing after saying that.
