Some of the foreground people were shot specifically for the image but most of the people were from our stock library.
It was a tough job getting all the people to sit in the image convincingly. Since only relatively few of the people were sourced specifically (due to time/budget), of course some might have slightly incorrect lighting and perspective but we tried to get them as perfect as we could in the time we had (which wasn’t all that long considering how many people we needed to include).
With the night images we could get away with a bit more by using some motion blurring, but it’s still important to ground and shade them all individually to suit the image and to blur them convincingly (on a per limb basis if necessary).