@1st Signature: Better than the last signatures you made, nice job. I still suggest you try adding more depth to your signatures, they look very flat at the moment. The render needs more blending in and I'd say remove that circular thing at the right hand side of the signature. The text could be improved as well imo.

@2nd Signature: Like Shodan said, the tech brushes could be removed from the signature, because it doesn't make it any better imo. BG, again, needs more depth to it. Text is better this time but there's still space for improvement.

Good try though and you've improved. Well done. Read a few more tutorials and you'll be on your way