Eh, just so you know. You're not allowed to double post, unless no one has posted in your gallery for over a month. It's called the edit button, you should get to know it.
Anywho, your banners. They are.. Rather flashy, and a bit disorientated/messy. There's more to banner making then just sticking a render over a flashy background. You should go read some tutorials in the tutorial thread, and experiment with other styles, as well as learning some techniques about depth, lighting, blending and colour co-ordination.
Also, outer glow is a no no, unless you know how to make it blend well. Since it makes your renders stick out too much.