Ok if you want easy opionion I can say they are pretty good.
For serious opinion (Skip of you don't want to read)
Main character (Subaru) is to blury. That's make him less important in your signature. Color theme blend together so that also make Subaru more less important. Best background color for light green object should be green too or red (maybe orange) light blue is good also.
The position where you place brushes and lines anre in good position. Good job.
You test XFire is to dark. Someone may miss the text too.
Again, you shold make your main character more important than background (Also text that color is to similar to background)
But the abstract background is nice. Compare to your sig right now. Your current signature is great example for text.
But is your signature style is blury I can't complain that
End of my opinion.
NVM you have rotating signatures. - -"