I am a Signature Designer and I would like to provide my services for the same.
My Portfolio with past works :
https://bitcointalk.org/index.php?topic=1936486.0
start a contest O.P that way you will have a lot of good design and you only need to pay for the winner if you prefer to have a second signature design you can also pay for the runner up so you can also use their (design)
Starting a contest doesn't confirm the payment because anyone can win and your efforts might go in vain, but it's a great opportunity for new designers to add designs to their portfolio.
For future requirements you might consider this thread :
🔥🔥🔥★OVERVIEW OF SERVICES★🔥🔥🔥