I have tried to offer my skills in signature designing but it is so hard to find a customer. I cannot provide them any previous work since I am just new to this forum. I just want to ask if there are any other bitcoin forums where in you can earn bitcoins and how?
I don't want to sound bashful or patronizing, but if you are a really skilled person then the best option is to create some examples of your work and include it in your portfolio.
You want to design the signatures are good at it? Then create various, random projects and fake services? Start a thread, include samples of your work there and it should be easier.
Additionally, from time to time signature campaigns start signature creation contests and everyone can submit an entry.
Honestly, if you want to earn money then there is no better play that bitcointalk AFAIK.