Think before retouching your image, are you trying to tell a story or add mood to your image? In this video, the brilliant Mike Browne gives a great demonstration of putting thought into processing an image to achieve good results in the finished image.
Sunset retouching is the same as anything else. You must ask yourself what the image is about, how to convey emotion and the journey you want to take your viewer on before you begin post production. – Mike Browne