I’ve recently come across a couple of techniques (in both Lightroom and Photoshop) that help turn a photo taken during daytime hours into a moodier, darker image. These techniques involves both overall image adjustments to darken and change color balance along with selective edits to add lights, increase highlights, etc.
I recently tried a quick version of this technique on an image taken down San Francisco’s Ocean Beach on a moody morning. It’s been adjusted overall to add the moodiness along with tweaking a few of the highlights to enhance points of interest in the image. This took about 5 minutes in Lightroom CC to adjust.