For this photo of the Half Dome in Yosemite, I first duplicated a layer from the original background and added a multiply effect to it. I saw that, that darkened the image too much even if I lowered the opacity level. So instead, I changed the effect to overlay and that seemed to give the photo a better, more even contrast without looking unrealistic. But I still wanted to emphasize the colors more and saturate the photo, so I added a curves adjustment layer and slightly darkened the sky and the lower forest. I still wanted to dramatize the photo so I used a dodge and burn on the top of the dome as well as the mountains in the background.
link to image: https://en.wikipedia.org/wiki/Yosemite_National_Park#/media/File:Tunnel_View,_Yosemite_Valley,_Yosemite_NP_-_Diliff.jpg