I do agree, it is a little visually empty. Its a little late for it now, but I'd suggest some boats and whatnot in the backgrouund. Also, its also a little late, but if you set the table away from the wall, such that there was a walkway between them and the water, then you could've had people going back and forth as the girls talked. You could've also put in some potted plants, intricate pots perhaps (as is the norm with these bayside cafes) and some chains or something to seperate the seating area from the sidewalk. Those are my ideas... Just some suggestions.
£10 says Lance is a darastrix! (heheh, easy money)