The design of your Magento store depends a lot on how your developer configures your installation, including themes. By understanding how themes work in Magento, you can better communicate your needs to your developer as well as properly assign themes to your stores.
Take the time necessary to explore the design and layout options available to you as the store owner. You certainly want your customers to experience your brand as you desire.
In the next chapter, we will work on the content that compliments your brand design as well as ways to improve your search engine visibility.