Kira-Lacus: Nice Haruhi sig! 10/10
Laharu: Great sig! 10/10 (Try putting your text on one line to see if that will get your sig to 500 pixels in height or less.
Seive: Nice use of contrasting colors! 9/10
Rin-Sama: Sometimes simple just works! 8/10 (If only it didn't look like it was over-exposed!)