The 2 rear pics are different. The last pic looks like they widened and stretched the rear track, giving it a boxier look and more like the concept they built. I could see the more rounded narrower one being closer to what a production car would look like.
One thing you always see on sketches and renders is a roofline with too much rake. I want to see a sketch with a cockpit that you can actually see out of.
one that has realistic proportions.