People are getting on this 'negative space' too much.
You shouldn't be whoring around to fill out everything you can in your piece with chaos.
IMO, you should be worrying on text and effects. Your text seems placed there out of no where. While that yellow circle brush isn't blending with the rest of the colors at all.
It's pretty good, but those yellow spots don't go with the render at all.
Text is too pixelated to be used in a smoother sig like this.
Sometimes, negative space is fine, HeavenlyFlow is right, don't try to fill up everything with crappy effects, you did a good job here of keeping everything more minimalist and simplistic.
Nice job, just work on text and think about the colours of the sig.
V2 has better colour, but worse text.
Use a VERY simple font, just a default Photoshop font, with a simple and neutral colour.
No blending options, and remember to place it subtly.