Art made with coloured pencils does not have to be sharply defined, precise and detail-filled. Pencils can create their own version of impressionism; loose and soft with boundaries spilling over, merging and melting into one another.
As you, Honourable Viewer, are not given every single bit of information, you are free to fill in the gaps. You can make it your own story, perhaps become one of the people strolling. While lack of specific detail makes the drawing impersonal on one level, it makes it more personal on another. There is plenty of room for you to add, interpret and imagine. You can actually put yourself into the picture.