I reckon the last three shots do not work with such a vignette setting. And while using higher vignette’s mean you can use higher exposure while not overexposing the shot. It should be noted high vignette’s only work with certain shots, like say using selective lighting to highlight certain areas of close-up shot set during the evening or night. Yet if you do such a shot, then you need to setup the car and camera angle in the right location. Or the shot will not look clean while having two uneven exposures showing up over the bodywork.