(Oldest to newest).
The Naruto one ish hawt *0*
The others aren't that bad either, I like what was done in terms of brushing/smudging/whatever. I dun really like what was done in terms of a border for the FMA one though-too much white I think. That, and the last 3 seem a bit empty without some kind of text =/
But still, overall, these sigs are awesome xD