I started off with a rough pencil drawing, blocking out building shapes and laying out where I wanted certain objects to be, the main focus being the stage door and mail shoot. I then started digitally painting the sky using my Hollywood reference pictures as a guide. It's just before 7pm in the film so the sun is setting in the distance.
When we eventually build this set we plan to only build the front portion of the alleyway to include the stage door, mail shoot and garbage bags. The rest will be added digitally using green screen techniques to extend the set, creating the long alleyway and sunset sky.