* I agree with hell gate. If you look outside and see lightnings, you will know the difference between your icon and the true lightnings =)
* The lightning needs a better color - something white
* Need a better ground - you can use your water ground, but you need a better view of lightnings in the water.
* If you use the water, you should add maybe a second lightning in the background and don't leave the background black, maybe add a light gray or something like that.
==========
Rating: No Rating
- Why: Because the icon looks like a first try of "How create an icon". I also don't rate it, because I want see some changes at the icon. Else if you leave this icon as it is, I also will rate it in some days!
Note: Everything I said is nothing against the icon, yourself or your work. It's only a personal comment, how I think about this icon.