Photo 1(template photo): In this photo the ISO is 3200, the aperture is 14 and the shutter speed is 1/100.
Photo 2: I overexposed this photo by keeping the ISO at 3200 and the aperture at 14, adjusting the shutter speed from 1/100 to 1/20.
Photo 3: I underexposed this photo by keeping the shutter speed at 1/20 and the aperture at 14, and adjusting the ISO from 3200 to 400.
Photo 4: I overexposed this photo by decreasing the aperture from 13 to 4, keeping the shutter speed at 1/20 and the ISO at 400.