No focus to a particular part of the signature that looks good, no lighting, text covers the focal, text is plain and doesn't fit with the color scheme, the focal area is blurry/ too bright, No blending, no smudging, etc.
Right now it barely makes 1/10 in my opinion. Depending on what program you are using, go to deviant art or planetrenders.net to find tutorials on how to make proper signatures.
*If you think i'm being harsh, I am. I am critically reviewing your signature so you can get better and improve, I got the same feed back when I started and it helped me learn how to make proper signatures. Good luck!
(Using stock photos (photos with backgrounds) is not a good place to start when making signatures in my opinion. You're better off using a high quality render to get a feel for your program, then move to background images.)