As a reference image for this 3d modeling retro cardesign project I was used a Ferrari 250 gto classic car profile view.Then I saw I have to move my front wheels forwards to get better proportions for my concept car.After that I just followed my creative mind and tried to find nice details,which are both modern and retro too.Blender3d was used for 3d modeling,for realistic renderings cycles rendering engine.For enhancing my renderings I was used GIMP .Enjoy my concept car :)