Camera angle plus composition. What is the focus here? Looks like the focus is that picture on the wall. If these two are talking they should be more focused. Try turning the camera so she is in the foregorund and he is in the background. The camera could be put at the arm of the couch at her end and focused back on the guy. Also try tilting the camera. If this is a conflict camera tilting can add a sense of drama. Right now the pic looks like something you'd find in a family album. I can understand reserving some dead space for discussion balloons etc but if that's not the case then over 50% of your render is dead area, ie area that has nothing to do with the two characters like the couch bottom, the wall picture, the space between the guy and the girl. Also what are you really shooting for here? Do you want photo realism? Do you want drama?