Hi, Kelly. In addition to the great list Edward provided, I would reconsider the way you have a mass of keywords stuffed into the left side column of your home page. Your home page is the first thing people see on your site, and while search engines may randomly hit those terms on occasion, you'll have better luck with both humans and bots if you formulate full, content-rich sentences, which may end up utilizing some of those keywords. Tell people what your art is about, what products are available, who you are--make it interesting and relatable, and it's more likely to be read (and picked up by bots that catalog your site's content for search engines). Do the same on your About page.
If those keywords are indicative of your work, make sure they're in the descriptions of the appropriate pieces (again, fully fleshed out sentences are most helpful) as well as the image keywords. Try to imagine what words you might use to be able to find one of your own pieces, if you didn't know the title. Describe colors, textures, places, moods, and only what's in the image. You have a precious 500 characters to use as true keywords, so make the most of them.