Jess,
SEO is a lot more than keywords and descriptions. Images have no influence on SEO since search engines cannot read images. They only read the text that describes the images.
The Web pages that come up on the first page or two of Google searches for any keywords are the ones that get most of the views. The goal of competitive Web site owners is to come on page one of Google searches. Achieving this translates into many views and hopefully sales.
The way for any Web site to work it's way to the top of the search results is to build popularity. Popularity on Google and other search engines comes from the quality and quantity of backlinks. Backlinks are hyperlinks on other Web sites that, when clicked on, lead to a specific Web page, such as an Etsy shop or a page in an Etsy shop.
You can learn a lot about building links/backlinks from Wordtracker Academy:
http://www.wordtracker.com/academy/link-building (Wordtracker has been around for many years and can be trusted. Plus it's free)