If you take a picture at an angle with light reflecting from the signature area and from the closest distance you can do and keep it in focus, you should get something useable. Do not compress the image, if you cannot manipulate the picture yourself, mail it to me and I will enhance it for you.
There are a lot of fake signatures out there, one eBay seller used to specialise in this 'art'and produced hundred of such signatures. Generally people here can only tell if the signature is genuine from a picture.