The text needs some work and the sprite doesn't really blend in to the background at all.It looks blurry.It has potential to be a great sig if you add some effects to the sprite to give a powering up feel,and also try and have less contrasting colors.
If it would help you at all I could send you the psd to one of my sprite sigs but I would search through the tutorials here first as I have seen some great sprite sigs by other artists here who are far better than me.But if you want one let me know through a pm and I'll see what I can do to help.
I personally like it. I love the whole feel. the sprite could be blended a bit better, but the text and the kanji really work. I think you did very well. 8/10. (oh, and I like the first version better. I'm a colors person... ^_^)
I love the BG. Excellent. It's just the fact that Akuma stands out too much from the background imo. Keep it up
um imo they are to blurry lower the blurr a lil an other font imo to blue dude dosent fit in the green bg maybe if he was green anyway good jobb keep it up