Exporting pages file to PDF Problem

I have a document with a lot of images that I want to make into a PDF. When converting from pages document to a PDF, I choose the Best quality choice, and It gives me the smallest file size. I tried it with The "Better" and "Good" selections and they both gave me larger files then with the best selection? Is there a way to adjust the settings of the quality when exporting?

I also tried to Print to PDF and it also gave a very small file that was low quality.

Thanks