Another step by step.
This painting was painted in 5000px by 3011px resolution which allows me to get enough detail in for a scene like this.
Rough sketch and blockin
Added some photos to get values and a more diverse palette.
Photos were added as "softlight" layers then erased in an out to get the value placements I wanted.
The photos were painted out using the "new" values. This was the step of which I decided to take it further. I usually sit around and paint environments just for fun.
Tried to get some story going.
Foreground painted in and atmosphere added. I tried to separate things in the background/middleground by using value and temperature.
Second dude added, tried to create a bit more panic in the image. Also more atmosphere added in the background.
Final! Police/car added and smashed, particles and other things added to create more movement. I also added a softlight layer with a warm color set to 15% to get swift the color palette around slightly towards red.