This is a pretty cool sig. However I feel compelled to say this render is used a lot and though it's one of the better versions of sigs with it.. I still feel like it's pretty common. I see this render smudged like this a lot and was hoping to see something a bit different. However I'm just saying this rly cause I'm knit picking to critique this. There isn't much wrong with it at all.
However you still did an A+ job with the sig, with the exception of the text :P. Colors are nice, blending is nice, depth is nice. Everything is great.
However you should try using a different font or something because your text isn't work IMO.

You did a great job dae, it's nice to see you getting back into it.