What i did in this picture is editing the sky color. Why i'm doing this? it's because the original color of the sky is a bit blueish. So, in order to make the car driving at night. I did a little adjustment to the sky color by using brightness/contras option. Before i did the brightness, firstly i select the area that i want only to edit. It is done by using Lasso tool. Then select the only area that i want that is from this picture is the sky only, after that edit it by using brightness/contrast option.