If you are a fan of landscape photography, it is obvious that you carry a Graduated ND filter wherever you go. However, by any chance, if you didn’t have such filter with you when shooting, you will have to seek the assistance of an image processing software. In this case, you will have to go for an option like LightRoom or Capture One Pro; these two programs have built-in features to get the effects of graduated ND filters. Using these software tools, you will be able to achieve more and more details.
In this case, you will have to take a low contrast exposure. If not, you will have to underexpose the image and try to get more details from the sky. During the post production stage, you will have to get the graduated ND filter and lower the exposure. After this step, you can simply play with the contrast and highlight options.