You're getting better.
However, there are very big concepts that you are missing out on:
Lighting, first off. There isn't really any lighting source and it looks as if the stuff on the lower right corner is where the light is coming from, which it isn't. One tip a higher-end GFX artist told me was to consider light from the beginning.
Your signature also lacks flow. It had potential but the hair and the weird thing behind him fucked it up.
Color is really bad. I'd suggest not working from a black background unless you plan to fill it up.
Also, the text is really bad. Text should never be completely plain. It makes it look really unprofessional. Make it fit in with the signature. Add some color too it.
I don't like the border, either
You're getting better though.