I'll chime in with pretty much the same advice. You can see in the photo how the bright blue edges of the roofwalk stands out, something that's easy to miss. Overall, the effect is really good. Like Ken said, find some prototype photos so you can see how the rust pattern developed. I know that later Rock Island cars didn't get the highest quality paint jobs and they deveoped quite a few rust spots as well as the streaking you've done on your car.