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I’m guessing that all of the pictures are of models made in Sketchup? Is the low poly and “cartoonish” look the feel that you are going for? What type of a driving game? One like Need for Speed, GTA, something original? Do you have a GDD? How much of the game is actually playable? Is there a webplayer or a video so that we can get a feel for the game?
A tip from me would be to not use Sketchup, as it has alot of errors when models are put in Unity (wrong faced polygons, messed up textures, etc.). A better free solution would be Blender.
Sketchup, Blender, and 3DSMax? Why usinf 3 programs that do the same?