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I suggest a funny or humurous signature.
Or it can also be a cool signature, where you put a picture of a character you think is really cool.
But I don't really care about signatures much. Dunno what their worth.
Your signature can be anything you'd like it to be; so long as it doesn't exceed signature limits. If you have any questions about your signature not being within the set limits, then you may ask for it to be checked here, in the Signature Rules & Review Thread.
Also, we have a forum "Graphics & Photography" forum where you can go into shops (and Galleries only if they are taking requests) and either claim a tag or icons for your signature or you can make a request for one. There is also the The Graphics Giveaway Thread which people will be giving away their own work for you to claim (but never forget to credit them if you're going to use it, unless they say otherwise).
Otherwise, I'd say your signature looks very nice and simple.
Your signature is fine now, but there is a limit the size of the images you can have in your signature. Check this thread for more info.
EDIT: Guess I got ninja'd. xDD;