Sketch of a Couple - original figurative charcoal sketch

Here's a sketch of a couple I was able to observe today - I was sitting some distance away and without my glasses, but I think I got the jist of the thing.  I know what I think was going on, but will leave it open to interpretation.  This will be a painting soon.
Yesterday, at the National Gallery here in London, I found a Vuillard painting I had not known about - The Earthenware Pot - and I love it!  Can't get it out of my mind. 
This drawing is on sketch paper, about 7 x 9", using General's Primo charcoal pencils.  Thanks for looking!