Hi ya castback , nice toon , what to work on ...here we go ..
first it's a toon right so exagerate the heck out of it , start with bigger wheel wells taller and larger .second make your wheels bigger much bigger. Chop the top slightly more , maybe add a big rear wing , they always add to the pic , add bigger air ducts ...remeber its a toon so you want things exagerated , dont exagerate everything but pick out things that you want noticed or to stand out . like wheels, spoilers, air ducts, or maybe an outside hood mounted tachometer . see what I'm gettin at ? Try this on another drawing using the same car you already drew . If you still need help I'll try to draw one for you. Hope this helps ya bro .