Good job man! the shadows and compositing are perfect, I've always had issues there ... Do you have any advice or tutorial for such great compositing?
Not really unfortunately, I tried to put a geometry in the scene and even the cut out of the people to have a correct shadow directly in the render output, but I was not satisfied with the result and I did everything inside Photoshop in the end (with a lot of careful cutting on the steps)... I just worked using some reference images and by eye.
Excellent job btw, thanks for your explanations and keep up the good work!