Welcome back. Hope you stay here.
About the sigs:
The focals are too blurry.
One thing that's bothering me is that the third one has 2 focal points and the effects are covering him.
You should add a light source to your hulk sig and make it less bright (it's kinda hurting my eyes :S, other than that it looks awesome.
I like the last sig the best, but again, the focal is too blurry.
Fix the blurs d00d!
Welcome back again.
