Well... Colors are really all over the place. Effects clash too much. There is no sense of depth. Keep working at it. Look at some tutorials.
That is enough, I have deleted all posts of the people arguing with each other. Now keep it on topic or infractions will be handed out.
FFFFFFFFF- Bah, nevermind. Anyhow, yeah, you don't have to keep it two colors, just find colors that match. When you have the sun setting, the biggest colors seen are red, orange, yellow, pink. That's four colors right there. Not to mention you'll have at least a 100 different shades of those colors.
i still hate the anime thing ou have. plus the colors are totally all over the place, and there is no real detail. IMHO a horrible sig.