After extensive research and testing, we have recently created banners with click-through rates of up to twenty percent. Depending on the site advertised and the banner network employed, our designs are averaging in the eight to ten percent range. What you have is essentially a billboard. In the advertising world, seven words is considered the limit for billboards. If the site advertised has something valuable to offer, especially something NEW or FREE, you will be two steps ahead of the game.
Questions are good.
Mysterious statements can be intriguing. Green, yellow, and blue are good. Black, red and grey are bad. Colors must be tastefully combined. The design must be balanced.