Here is my photograph that I am going to use to be the center of my composition.

I start out by using the quick selection tool to select the cabin and some of the ground. I then copy and paste it to a new document in Photoshop. (I just use a generic size and then extend my canvas with the crop tool).  Next step it is cleaning up the image.  You can use the erase tool, or you use a layer mask to tidy up those edges and get rid of anything extra the quick selection tool may have selected.

I then add more ground by selecting some from other pictures I took from the same shoot. Keep the edges of everything soft by using the blur tool or use a soft brush on a layer mask. Next, I add the sky and use a black and white layer to make everything black and white.  In this picture I used a cloud layer from Jessica Drossin’s Macabre skies and overlays.   However, you can use one of your own if you have one! To make sure the light is coming from the same direction in my clouds as it is in my cabin picture I flip the sky horizontally (which may not be necessary in your image) and then add a gradient fill layer (white to black) to change the light. I changed this to layer to soft light and adjusted the opacity to my liking (28%).

Next, I added a smoke layer for the chimney mostly to add more drama! The smoke layers also come in Jessica Drossin’s Macabre Skies and overlays package. Then I add some more smoke/fog to the bottom using another overlay.  You can also create a fog brush. Phlearn has a very handy tutorial here.

Then I notice the ground in front of the cabin is a little too bright.  So, I simply paint over it with a soft black brush (on a new layer).  I then set it to soft light and adjust the capacity to my liking (54%). Then I add a stamp visible layer (which is all the layers put into one new layer) by using the short cut Ctrl+Alt+shift+E (on a PC).  I then went to Filter + noise + add noise.  I selected Uniform at 1.05% - Then I set that layer to soft light and adjusted the opacity down to 38%. This just brings everything together in a more cohesive way.  

I then darkened part of the entire image and added contrast using dim the lights action (which comes with Jessica Drossin’s Macabre Skies Package).  This is a Gradient Map layer, but you could just add a brightness and contrast layer to do roughly the same thing. After this I just cleaned some of it up using the clone tool, and blurring parts of the image.  (Blurring can trick your eyes into thinking something belongs in the image when it doesn’t.) And then you have my final image here: