Originally Posted by
Round Tuit
...Duplicating the layer and changing the blending mode to multiply does add density and darkens but it also messes up the saturation and white balance. It worked quite well for the sky but not for the rest of the shot. I would suggest restricting the multiply to the sky with an appropriate mask and using a curve layer in luminosity mode to darken and add contrast. This would give you a better base for further localized dodging and burning. Others are better qualified than me to suggest where to dodge and where to burn.