An S? What color?
If you want her to look good, she needs to match but contrast the car so she stands out. Ideally your S is black or white. They're neutral and go with anything.
Something with classic elegance to match the styling of the car. (OK, that's also my personal bias. I like solid color and smooth texture and elegant curves but without extremes.)
And in that photo there's only 1 really elegant thing. Not saying the others don't look good, just not quite matching.