Simple really, just tell me the details of a signature you want, such as dimensions.
It would help a lot if you got a good stock photo or render from google, yet telling me what you want on it wouldn't be a good idea, but can help.
I charge 450tc, and you can use the signatures anywhere you wish.
Some samples of my work:







First three are 100tc, then I do no more for 100tc, but for 450tc.
Avatars are 100tc.