When you talk to a potential customer in person, it's natural to share information about the process, the history, and the vision that makes each of your creations unique. In other words, items that typically requires some thought and research before a purchase are more likely to sell well through a web site. Items such as books, CDs, and software are very information rich, and are selling quite well on the Internet. Lets start with the big picture. One of the prime bits of information people use to determine value of an art work is the context that they see it in.
Some people object to that, decrying the influence of packaging.
I don't agree. The way you choose to present your work conveys a lot of information to your clients. Look at other galleries on the Internet. If you don't have the time to learn the fine points of site redesign, consider contacting a professional for help. If you don't want to spend the cash, approach the designer about bartering some of your work in exchange for the look you want.