Success story from Brick Lane Market - A play in three acts

Later in the afternoon I was watching them selling near where the old tube station used to be, a random tourist walked by and got his camera out to take a photo of some artwork behind one of the scumbags. The seller quickly looked down, pulled the peak of his baseball cap over his face.

a 400mm ish lens on a camera from about 50M should sort that. Any good approach angles?