One quick thing, whenever your starting one of these edits, one of the main things that you should always take into consideration is that you should never attempt to alter the the direction of the original light source.
I'm not a photographer but I don't think that the sun that close to setting would cast the front shadow? At the point shown, it is just minutes away from setting with no shadows being cast at all..right?
Sorry, but you have completely missed the point. This is about how the original light source interacts with the entire image, primarily the car itself, shadows included.
You have an original image that is lit mid high and from the left..............your edit is trying to convince me, the viewer, that the scene, primarily the car, is now lit from very low and directly behind the car.......it DOES NOT work.
Don't try to alter the direction of the original light source, your edit should incorporate the same light source.
In fact, by the time the bottom of what you 'see' as the sun has touched the horizon the sun has in fact already set and is no longer visible.
What you see 'at sunset' is a refracted image of the sun. Its light is refracted through the atmosphere and 'bent'.....like a straw in a glass of water....so despite it having physically gone below the horizon you can still see an image of it above, if only for a minute or two.
This is why at this point it casts no harsh shadows as there isn't any 'direct' light coming from it. Any direct light you now see is 'reflected' light off the atmosphere or cloud, which then gets diffused or scattered before hitting the earth.
This type of 'diffused' light gives a very soft, light shadow with no hard edge.....if any shadow at all. It would be very difficult to distinguish a shadow from the surface it falls on....its that subtle.
Sorry to bore you with that detail.....it comes from my 3D background where getting the light right is absolutely critical.