Hi!
I made this images using just an HDRI and a ground plane with a concrete material
Hope you like it
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Overall, the compositing is working fine, but in my opinion, the white areas are clearly overexposed. You should adjust the lighting to retain some details in the white areas. Maybe reduce the light intensity and make a few adjustments. Your first picture isn’t bad, but you’re facing some antialiasing issues on the back cover, possibly due to denoising in KeyShot, i’ve noticed that sometimes it helps, but if the settings aren’t perfect, the denoising can cause this kind of ladder effect. 
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I agree with Zeltron, to add something, the shadows of the car are too sharp imo. Not sure if you use the sun/sky but if you adjust the size of the sun that gives softer shadows.
Thanks! I’ve found some issues with texture images using the denoise filter. It kind of washes details and makes a weird aspect wiht the details.
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The scene uses just an HDRi
Ah, maybe the scale of the ‘scene’ is really small so shadows get so sharp. You could try to make it larger so the virtual dome for the HDRI is a few hundred metres wide. At least, most of the time I’m around such levels with outdoor scenes. It is a really bright day though but those really sharp edges I don’t see that often, might be because I live in The Netherlands and the weather is most of the time not like this
Now that you mentioned it, the size of the environment could be a little bit small taking in consideration the overall HDRi location. I’ll try to make it larger and see the effectsd on the shadows.
I live in Mexico, so sun could be harsh sometimes. Maybe not that hard shadows, but definitely some sun burns if you don’t put sunscreen. 