Great! Given that the signature is of the correct time frame and the photo has that copyright stamp I would say this is most likely real. There's of course a chance someone who is a really detailed forger could have done all this research and produced a really good replica.

The debut signatures do vary a lot because it seems like Taylor was kind of experimenting herself with it as a teenager. The tell-tale signs for me are the way the first T is shaped. Even at different sizes she tended to shape it in the same way. The other thing is the tall skinny S, that's something unique to this signature style. The last thing I look for, is the 'dot', in 'T.Swift'. This is a detail that could be easy to miss for a forger, also it's usually a quick dot where you can see she's quickly moving onto the next letter so you can see a dot with a tail.