One area that is mainly distracting is the front door (as its right hand drive i'd refer to it as a drivers door)...the blue is much darker and blurry in comparison to the wide arch you've added! The cure this, i'd try and use some of the reflections from the fender and drag them onto the door(s) to make the more uniform...
If you look at the above image...notice how the colors on the wide arches are the same as the ones on the side of the car, and how the reflections dont stop when a new panel starts...yes there is a dark line (shadow) between the panels but essentially the colors and shapes dont change!
Maybe that helped a bit...on your chop you have very light shades of blue on the wide arches and the bonnet but the side of the car is very dark...i hope i explained this in way you can understand!
Also the front bumper is a little warped...but the color is a bigger issue!