Quoting .Illya. .Verpraet.
Sorry to say, but your modifications didn't turn out very well.
Some tips for modding existing sets:
-Try to always use the same color
-Try to keep it realistic: How many cars have front bumpers sticking out like that?
-Start out by making light modifications of the things you don't like about the car; if you think: I can't do this any better, don't touch it!
-If you want to 'chop' your car (i.e. removing a part and then building a new one; example: My cool cars shooting break), have a rough plan in your head about what you want to do, also considering the bricks you have
-Evaluate: If you know you can do something better, do it, and post later.