It takes a genius to make something worst than It is
jk
The siggy is not bad considering you'r new to signature design and everything. Try not to include any texts in the future until you master the other things such as the selection of backgrounds and the replacements of the render. Also, don't use the same BG to give more effects to the signature, it's a BG after all, shouldn't be used on Soft Light or Overlay just to try giving the render some sort of effects that is not required. Light source is good, but the signature feels a bit empty. There's allot of space on the right and the left side with the same dull effects.