Hi there, Liron here!
Hope you are doing great ^_^
I recently posted a people painting process on Instagram.
Wanted to share here as well.
Here are the stages:
And here's the comparison with the reference photo:
And here's a closer look at each stage:
Sketch - very loose and simple.
Starting to paint the first layer, not worrying too much about the colors merging a little.
Finished the first layer.
Added the shadows and some people in the background (and perspective lines).
Painted the background - coolest part (:
And added some more shadows to the people in the foreground.
I didn't use many details, and this is a very small sketch (about 5" x 7"). I think this really goes to show you how few details are necessary to establish a fairly realistic impression.
Also, with this being a small sketch, I used a fairly direct approach, with lots of negative painting and basically zero washes that cover all of the paper.
I hope you enjoyed seeing the stages and the final result!