There is a step that he makes a layer by ‘curve connected with mask(it should inverted to black)’ over the clouds-ship group and he used burn tool or doge tool to create deeps and details shadow and light ...I can give curves for saturation ..or for dark tone ..but how to made it curves effect connected with black masking and burn or doge on the black mask
If you watch the video you should understand "this step"
Again sorry I should put photos (for example) but unfortunately your forum can’t expect any photo to upload