Nice post and great drawings, your ability to capture the mood of these people is amazing.
When I was in Art school a professor let us design the stage for a play. When we went to the rehearsals we were also drawing the actors. It forced us to only capture the essence and suddenly you also have all these movements happening that somehow you want to find a way to get on the paper, this makes the whole drawing more alive, something that is less obvious when drawing from a picture.