It's okay for what it is. Minecraft related signatures are very hard to make perfect, even I hated that signature you were talking about on your first post.
Some suggestions, just try and make your character a bit bigger, and if you can't try and take another screenshot of your character in a closer view or let someone else take an SS of our character in the sky. And the text doesn't really make it any better, but you could remove that shadow and reduce the opacity a bit. Also make the color in a shade of blue that you won't really notice at first. Would bring a better focus overall.
If you want to, you can send me the .psd and ill try and edit it in my way for you, since I like where your idea started.
