Pretty good actually :3
Just some tips:
1. Try not to lighten the background like Zanda's one, it just ruins the background nothing more, nothing less. Use instead Gradient Maps with different color and stuff, example would be Gusty's one, the text fit the background, however with a small color manipulation with the Gradient Maps, it was even better.
2. Try use neat, cool fonts with fit able colors, you can get help by Gradient maps as well (in the Blending options) you can use give it a cool border, add some shadows etc.. Texts are like magic, if they are good, your signature would be great, if they are bad, they would ruin your signature completely no matter how small they are