What program's are you using? I think also reading some tutorials would be good as well. Not many people here will give you help or be nice about your sig (unless they're clueless), but honestly, you need to start working with photoshop (or GIMP, or whatever) and watching/reading tutorials, because your sigs are not very high standard, at the moment.
Note: I said "At the moment". Anyone has potential to be at GFX...