I like it.
The grey colors fit perfectly, ecspecially with the goku as a type of contrast.
I think the goku image just makes the whole sig good. Call me crazy, but I like it just fine.
I suppose if you had to fix something, I'd give it a theme of somesort. Models and goku aren't much of a theme, but I wouldn't change it personally. But maybe that's why I'm not very good at sig making lol
Don't cut it. The grainy stuff around Goku adds a little depth. Plus it isn't a terrible cutting job. I can just go back into my old sig folders and show you what a terrible cutting job is.