Lack of "bubbles"- to me, there should be more, and perhaps a few up close and blurred to make it more realistic. :3
Either way, it still looks awesome.
That's prety good~! The only thing I can think of is that, with the darkness, you accomplished the water part pretty well, but that part that I assume are to be 'bubbles' looks a bit more like sparks......just a thought. but in general, it's a pretty awesome picture.
Either way, it still looks awesome.