It is a quite a complicated process considering how small the details are. I start drawing a path of the windows that are on the back of the windshield. Then I apply gradients and change the layer blend modes according to what it’s needed, sometimes multiply, other times overlay or screen. Since you want to cover the cars that are see through but nor the car inside, then I do same process with the windshield. The requests are very annoying considering this is an used cars magazine, and they are done within a less than an hour deadline. But I have always have them done on time.