Try something more star spherie. and maybe replace that pelican with a heron. This sig looks to happy and too corporate like the USI sig, which is not proper for this one IMO. edit: this applies to the concept button in the 3rd example.
the signature should have a menacing feel to it (like the logo itself), I just don't feel the vibe here. red and black instead of white and blue might work better.
I'm pretty sure I'm going to be a nitpick about this until its the way i want it, so i'll make sure you get a generous enough tip even if i end up not taking you up on this at all.
(also, snubs should be a bit smaller just to give perspective for the larger ships.)
edit: i like how you handled the banner btw.
2nd edit: i edited the OP, I think the character profile is too much a distraction for now, as it is really secondary to the sig (it can stay in the template, but i'd like something that can easily look good with 2d studd like this; http://i.imgur.com/I1slQ.jpg )