We have just returned from a holiday on the Devon/Cornwall border where the sky was mainly grey other than a few hours when the sun appeared. I probably should have left the camera in the bag but as I wanted some record of where we visited I took some shots. Straight out of the camera they look drab with flat light, but using Lightroom’s grad filter and some other adjustments they look OK so not a straight delete. This is where I struggle as I do not like over processing. In reality the sky was grey, there were no clouds and no blue. I am not replacing the sky but enhancing it considerably. I suppose as I am only doing this for my benefit it does not matter. If I had more time I would revisit the locations when the light was better, but I do not have that luxury. I would be interested to know where others draw the line with processing landscape photos.