Ok, so, there are alot of things i have to say about it:
• When changing the size of the render, press SHIFT and resize, otherwise it is going to look weird.
• After you have the render you want, try to work with its colors, wich i see you kinda managed to do.
For example:
• Lightning, that is another important thing in signatures. And you didn't manage to get it. To add a nice light source, just focus the light in one place and darken the corners. Example:
• Learn to work with gradient maps, they help alot to give the signature a nice color managment.
• The typography, never, not ever, put it in the corners, it just don't look good.
Try to do something fun with it, for example:
I am sooo sorry if im beeing rude or something like that, it's just that, for the first signature you did really good, and who knows you might have some talent for design.
BTW. This was my first signature ^^ something like 6 / 7 years ago. __________________________________________________________________________________________________________