If you made that signature without bindly following a tutorial then congraturations, you have a better signature than many other people.
Otherwise, you still have a signature better than quite a few others... =)
What could be improved:
1) Kakashi's blur to the left isn't good looking at all same for the little flare on the eyepatch.
2) You probably applied a layer set as value and that causes those tiny green/red flares to appear next to the text and the eyepatch, causing it too look like a low quality image
What you could've added to make it better/ what you could've done differently:
1) You should try to apply the rule of thirds (
google it).
You didn't entirely ignore it, as the text's placement is right, and the mark on the eyepatch is at the right height, however the rest doesn't meet the rule's requirements.
2) You could've played with the render a little more: it's really important to have the render you chose to fit right inside the other layers, without having it bump on top.
Usually people fail at this and you did something about it (the blur and the background), but more is better in this case. The idea is to have the render in between other layers, having the layers on top of it "connect" with the ones behind it. This is called blending and if you'd like to check a good example,
this is one of my older artworks i did to practice it, i think it's a good example.
What you doped:
1) The text looks really neat, the font fits well with the brush you used behind it.
2) The background fits really well
OVERALL: 8.5/10
Your signature looks fine, it does have some fails to it but that's fine.
Considering it's your first one, that signature's a dope. =)