Ok, I got a lot of people commenting on the focus and pointing me out to sharpen the image. The deal is I added a bit of Gaussian blur and that is the reason for the soft focus, but apparently people were not liking it... But I thought it was cool
Interesting idea; might have been better though if you had taken advantage of the diagonal, rather than the "vertical centric design". Also, glass does not look like it's in a natural breakage pattern, but rather laid out. Might have been really dynamic to break the glass and try to capture the action!
The main problem I have with this is that you are showing action without the action. It doesnt look like a natural position to find these items in, they look deliberately staged and so loses the impact of the 'shatter'. Understandable you didnt really want a hand in the shot, but had you held the hammer at a diagonal off into one of the corners it would have helped give the impression of being 'in action'.