My signature is pretty big

Ehhh.
The idea is p cool. It's way too big. It looks ridiculous and very unpleasing to the eye.
It will look like you added a full image to every post of yours.
I suggest shrinking it to a reasonable size. Cuz atm it's just crazy.
Also, I would recommend that you redo the screenshot. Put a cool shader on.
Also, it wouldn't hurt to put some colour correction on it.
Btw what program did you use to create it??
That's all I have to say about your signature.
It has a lot of work that can still be done, but none the less it looks decent.
Good job.