I agree with the advice about learning about composition, but can't understand why you'd cripple yourself with a 50mm prime. I find 70-200mm to be close to ideal for 80+% of my auto shooting.
I think your images lack a little contrast. The exposure value is about right, but most look "flat" to me. Try working with the Contrast control. You might also try a modest S-curve in the RGB window. Be very sparing with Saturation and Sharpening. Make sure images are really sharp by looking at them at 100% and assuring that the focus is where you want it.
I started with a 50mm, but that was the 1960s!! Zooms weren't near as good as they are today.
To me, a 24-105mm and a 70-200mm really covers a lot of ground. To my eye, "portrait" focal lengths in the 70-150mm range work really great on cars.
Dave
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