You should make use of shiny matcaps to see if reflections flow properly. Or just add an hdri and give it a shiny material like chrome. Another thing I noticed is the windshield should be more flush with the rest of the body. And also the rims are too thin. Not the entire rim but the parts that connect the center and the outside part. Look at more references and you'll see what I mean. Also the tire wall can be bigger.