1. A plain white background! make it interesting for the surfer! Try using a colored table on the gallery. Try matching the colors with the colors of your sponsors tour....
2. Both text links are the same wording. Diversify! Neither text refers to 'latina' which is what you are trying to sell. Get a couple of good text links going that will get a latina looking surfer to click!
3. No text accompanying the banner. Try a good one liner right above or below the banner pumping up your sponsor.
4. At 800x600 you are forcing a horizontal scroll....make the thumbs small enough so that doesn't happen.
5. Try using a mouseover on your sponsor links so the surfer doesn't see your sponsor code. This can up your click thrus by up to 10%.
Hope this is helpful