Along the way I decided to switch the palette of the picture by adding some cold colors in shadows and warm colors in brighter areas. I think it looks good and delivers art expressiveness to the work. Afterwards, I placed zombies, dead bodies and pools of blood at the streets (which was OK with the style of the picture). I found a few photos of characters exactly for my work.
I grouped the objects and started editing them. One of the most important things here is to make the character look natural in the environment. To achieve that I used transparent layers. Lights, shadows and overall gamma of the character should not fall out of the picture's tone. You can follow the way I was doing that.
That's it! Hope you enjoyed this small tutorial and picked up some ideas for your art work.
If you have any questions or comments, please feel free to contact me.
My email: email@example.com
My blog: www.kashivan.blogspot.com