Jesus!
Lith: Assplosion of contrast? Could you turn it down a bit? My eyes are burning out.
Gryph: Awesome, but you should seriously add more to that background, it looks incredibly dull and boring.
Elcor: Turn down the brightness on that one. You could also try Gaussian Blur, then go to edit>fade gaussian blur and put the blending mode on hard light, turn the opacity down a bit. Might give a nice effect, don't know for sure. Get rid of the face above Vega. Change the text color so it is easier to read. And never forget a border around your signature.
Lukyas: That is one of the most messiest and chaotic signatures I've seen in a long time. Your [overused..] BG style does not flow with that stock in any way. It just makes it bad. That, and the gradient effect on your texting sucks, so does the font by the way. It took me 3 minutes before I could even find your text in that chaotic mess, and now I see Spartans everywhere. And did I mention you should change your background style? Think of something new?