Lighting is good, though perhaps slightly too white on the background and a tiny bit harsh on the nose and cheek bones, though that's probably down to the ring flash.
Focus on the glasses and hair is good, but the cheeks and chin look a bit soft.
Did you try any other lighting/flash set ups?
I would perhaps use a spot light to light your backdrop and then bounce your flash off either the ceiling or a big bit of white card (in lieu of a reflector or umbrella).
Might I suggest you buy an
off-camera cord for your flash. Then stick it up above your camera on a tripod so that if fires down a bit.
Also, take a look at some of the flash tips from Dom Bower on youtube, like this:
http://www.youtube.com/watch?v=91gU93J2Q8kAnyway, pretty good for a first attempt.
