I like the manga paper feel to it, though some might disagree, as it sort of makes everything feel slightly faded. I like it because it looks like it was scanned right off of a page of a manga, complete with the rough texture of the paper. I think I like the top 2 are my favorites, I prefer the colours to be somewhat stronger(for the colored version) and I like the greater contrast in the Black and white one. I feel that the elements are too faded for the others. All the elements I usually pick at are pretty well done, good focal, effects, flow and the character definitely works with the background. The lighting is subtle, and works well. The colors work with the overall feel. Good job with the vectors, even though they are large, they aren't taking the view off off the character. The kanji in the corner (japanese script) is well done, as it adds to the manga feel, as well as being unobtrusive yet visible, which is hard to do with text. Nice to see you're trying sigs again, you were always one of the better artists around here, I still remember some of your stuff from when I was just starting into graphics. (That must have been over a year ago now...) Sorry I can't give any real feedback thats negative, you're ahead of me in this stuff, I really can't think of much to nit pick about.
Appreciate the comment. Must have taken abit of work to write all that out. Personally I like the colored aswell, and will have the one I like the most in my signature spot. There's always something small that needs to be fixed, however your comment is well heard.
Try something? Go back in, open up your favorite colored one, and delete the warpy blue effect over it but only around both eyes. Leave it around the rest of the signature. I think that'd look boss