+Render
+Colors-completely match with render
+Brushing-fits in with the sig
+Font-Flows with the sig
+/-Border-dont really like it, I'm not saying its bad but like, sometimes a transparent border is good, sometimes a obvious visable border is good. I think a obvious visable border would be better IMO.

But it's a really nice sig, you said you felt something missing, I get the same feeling. I think to me, theres too much white around the render. But idk, maybe you should work on it a little more so nothing feels missing. Good job, I'm really liking your stuff.