4/10 on all doesn't look like you put much time and effort into em, backgrounds kinda cool though, but faded.
8 8 neat bg's 7, cuz I've seen that render too many times even though Kayuza rules video tut 4 below sig
top: pretty good, could've had your full name though and abit more good effects.. 8.5/10 bottom: awesome, I love burnout, the video there doesn't really blend in very well but hey, it's a video =] 9/10
...but I like white... Anyway, you have a bunch of stuff on your sig there but it doesn't look as good as some stuff i've seen. It's alright though, so 6/10 =]
Too much white overtaking the renders colours. Bg seems too weak. It's also too long. I call that a banner, not a sig. 5/10
10/10 for both. well done with colour matchng the bg with the skin tones and hair. But your avatar is pwnage.
7.5/10 Nice bg and colours. The sig is too long though and with no text it just seems empty. The random black gap on the right kinda ruins the feel of the bg I say.