Well yea...you managed to follow a tutorial well. Thats fine. I can't grade you on this, you need to do something at least....but it would get a 1 or 2 out of 10..
For a sig (sig's are a waste of artistic time In my opinion, but anyways) you shoulw be looking for a better size for one. Secondly, plain black background is a no. If you are a beginner, shove in soem brushes/renders at least. I don't like the 'flaming text' thingy, too cliche...no border either...
Basically....no, that's nto even a sig. But don't get disheartened, you've completed that tutorial and you know how to do the stuff which it entailed. Your a toy, you're entitled to bite stuff from others work without them complaining, look at other stuff and try and work it onto your piece. Keep trying, and keep developing. You've just started the ball rolling, good luck.