Darkening the sky adds drama to any picture. This is true of a landscape, a cityscape, or even a portrait or a wildlife image. This view of Cobh, Ireland looks like I replaced the sky, but all I did was darken it using the gradient tool in Adobe Camera Raw (Lightroom has the same tool). I did do extensive Photoshop work in removing power lines that were in front of the beautiful and colorful houses, though. To get this shot, I had to climb on top of a stone wall.