I've talked here about ways to get a better looking shot. There's the The $4.95 Solution To Make Your Videos Better and remember the importance of showing a philtrum.
But here's another one. Don't use an executive chair when you're doing an interview.
(can't see the picture, go here: http://youtu.be/FIYnDo9BxgM?t=10m)
Executive chairs are super comfortable and make you feel regal. However, on video they make you look small. The backside of the chair goes up to your ears and kills the needed seperation between you and the background. Plus, your talent is going to end up swiveling and that's going to make your talent look impatient as well.
Use a bar stool or use a chair with a short back. Sit back alll the way and keep your back straight.
(can't see the picture, go here: http://youtu.be/JecJzrIfdHg?t=3m37s)
That feels better, doesn't it?