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I can't help but thinking that if I was taking your portrait, I'd have the camera quite a bit higher than it currently is. This is not a particularly flattering angle for you. In addition, the further you can get you from the backdrop, the better off you're going to be. And rather than use f/16, try and find a power setting on your flash (or a lower ISO setting on your camera) that lets you use f/5.6 or so. That will help not have backdrop wrinkles in focus.
At the same time you try raising the camera, try raising the light as well. You've been making good progress. Keep it going.