Banner Design or Selection for Currency Exchange page

I need 4 images that will fit perfectly in the top of this website : [login to view URL] I'm attaching 3 images so you can see what type of quality I'm looking for. I am opened to any suggestion but the images need to "somehow" be relevant to the 4 titles below. It needs to look very-very professional. The 4 images that are currently on the webpage are examples of what I am NOT looking for in terms of quality for the banners. Please do not bid if you are not qualified as I am not looking for childish graphics. Thank you ! If I am satisfied with the project, I will need more images/banner/graphics to be done during the next weeks. So this project is more of an ongoing thing.