Okay here's my proper cnc (please don't take this to heart)
First off I would say, don't do popout signatures - tbh they never look good (but if you really like pop out sigs then practice the basics first, such as background colours text etc)
Next I would say find a good render to work with - the one you used is it bit meh :/
When picking your render make sure it has some sort of movement or direction and it's high quality
Next I would say don't use bevel and emboss with your text, I've never seem it look good
Next make sure you try to add at least two different colours which complement each other.
When you make your next sig try 400*200
If you want help and advice come and ask me I will always answer and even find examples for you xd