Testing Layers of Photo Shop

I wanted to see what other layers looked like in photo shop, so I experimented with some photos I didn't use to see what looks right and this is a photo that I came up with.  I'm going to start working with my models tomorrow and then see which layers work well with them and other photo that I've taken in order to get the image I'm trying to set.

Over the weekend I took pictures at night when there was hardly anyone up or about.  Granted there were some people and cars, but it was the right amount that I needed.  I wanted to test how much light my camera needed in order to take the image I either saw, or was trying to create.  These are some of them.  Soon I will be trying to layer some of them with a model that I will work with later.