Thats a good catch jackp. The plane shadow is actually on a gray board. I just loosely erase the board and then use the shadow layer as multiply to try to keep the details of the pavement. Doing this creates darker black. I should have made the shadow lighter so in the multiply it would all work out. I dont believe the shadows under the cars are softer, its just that the shadow of the plane is too dark. If I softened it then the edges would match. After all the shadows are all the same taken at the same time outside under the same conditions.