This is a very engaging and enjoyable image! The idea and execution are both excellent. It creates kind of a puzzle that is a delight to figure out and/or just look at. It is certainly symmetrical!
A few voters mentioned below that the reflection is just a tad out of focus. Otherwise, I find your composition excellent. The lighting is also wonderful as you've been able to get the light on the hand without geting weird light reflections on the mirror. I bet that was a challenge.
It is a very dramatic image, and the lines of the fingers are appropriately curled for best dramatic effect. The lighting is quite straightforward, though, and you may want to experiment with different angles and levels with this shot in the future to add even more mystery and drama to it. the tight crop is great and this in an image which you put, appropriately, right in the center.
I like this image a lot and voted it highly before. Congratulations on a well done photo!
Reflection is just a pinch out of focus. Good idea and pretty well executed. I like the lighting for this shot and lack of anything visible in the background. Makes the hand really stand out.
I wonder aloud what this would look like if the background had color, and the hand was in silhoutte. Good shot - nice visual impact. The reflection on the right is a tad out of focus though.
You might want to get that checked! :) I had thought about doing something similar until I realized that I don't have a good mirror. Nicely done -- funny effect!