the dark lines could use a lot more darkness i think, because in real life, if you look at it from that focal point, they will be darker than what you have in the picture, but i could be wrong. also, the edges could be a bit more rounded, and the lower part of the bumper evened out, specially in the part where it looks like it hit a curb facing forward. the side profile is good, specially the depth of field and the exposure on the car and the background makes the subject stand out. only again it was let down by the harsh abberration on the rear spoiler area, and the lines on the car. try using the smudge tool at a low opacity next time to easily get rid of these problems. not a bad effort altogether i must say. keep at it!