I think you've done an amazing job. If I could offer any suggestions it would be that perhaps the shadow could be a bit darker on the underside of his face. If you look at the forms on the rest of the picture (the girl's legs, the guy's nose, the folds of the guy's sweater, etc) it's quite bright where the light hits, and has a noticeable shadow on the underside of the forms. The exceptions would be the forms close the the white tray because of the bounce light, and as a result the shadows aren't as strong.
But on first glance, it looks very well integrated. Great job!