Well, the main thing about it now is that since the background is pure black, it seems rather bland in my opinion. Before, since the sig was shorter, the black background was covered more, so there was less actual negative space. But now, there's a lot of it, and it just looks...funky. Just to me though. Otherwise, it is very well done, I love the colors, and I am waiting for a good chance to try out your new song. XD
Hope it doesn't seem too critical...>__> I don;t know what you can do to "fix" the sig, if you even think it needs fixing. If you like it this way, keep it, but it is something that I would address if it was my sig.