Sorry to not go along with the comments of praise. But I can tell you a few pointers to help you in your next sig.
Some better text would help, I've been doing this for a very long time, and text is my weakness. But you'll get better. Don't lower the Opacity on the text. Make it stand out a little.
The smudging on the left side is a bit obvious, tone that down just a little. This (unlike your others) lacks flow. There are effects going in every direction.
Colors are nice, except that Captain Jack doesn't have any color of the bg on him. It sort of looks like you made your background and just pasted the render and erased the edges a little. Have your render as the main part of building your signature, it needs to stand out, but also share the color scheme. But I really like the colors you chose here, so good job on that.
The effects overall are nice, and this shows potential. just keep at it.