Unfortunetly with the second picture their is to much yellow to get rid of, maybe someone else can.
When it comes to taking pictures of the cars, locations are key, and you really need to scope them out before you plop a car down. A sign in the background, parking lines or a tree "growing" from your car can make or break a picture. I'm not perfect I've been known to rush through a picture only to have something really stupid show up in it.