Although, in my opinion, the reflection is a bit odd at the moment. The area around Harry's eyes is completely free of any reflective elements, and the area with the Voldemort reflection lacks transparency to see through to Harry's skin. A reflection would not be completely opaque, it's almost more like a "double-image" in which you can see what's behind the glass, as well as the brighter spots of the reflected image (because what you're essentially seeing is reflected light, the darker areas of the image won't really be visible in the reflection). A Screen/Linear Dodge/Soft Light blend mode might help. I see that you've been trying to accomplish this, but I don't think you've quite worked it out yet.
I played around for a few minutes with the image below, just to better illustrate what I mean. I've also attached the PSD of my file for you to dissect, if you so choose. By the way, this is by no means a "perfect reflection," I realize there are flaws in this reflection as well, but I think it will give you a better idea of what I mean...
[attachment=17052:potter_reflect.jpg]
[attachment=17053:potter_reflect.psd.zip]

