more advice please!!!!!!!!!!!

ok guys these are three sigs i have made.

they are the only sigs i have ever made, and kinda taught myself to do it.

but theres a lot of open areas in them and was wondering if you guys could give me some real tips on how to improve them,

please dont say emboss or bevel them coz i know about that i just havent dont it yet.

there is:
a 2pac 1
a killzone 1
and the Ninja one( i am currently using this one)

please comment and give me advice.
[IMG]http://i682.photobucke*****m/albums/vv187/reeciboi/SIgnatures/2pacSig.jpg[/IMG][IMG]http://i682.photobucke*****m/albums/vv187/reeciboi/SIgnatures/KillzoneSig.jpg[/IMG]