Hi Matthew,
I would first work on your titles. You have a lot more room in them to add other keywords that describe your products. If you can come up with other ways to describe them, you will be able to cover more bases/search terms that customers will be looking for. Also, make sure that your tags match your keywords in your title and are two words or more, rather than single words.
Also, add some more details to your item descriptions. For example, on your birch coasters, you don't have the size listed. I think that is an important bit of information that customers will be interested in. The less work customers have to do, the more likely they will be to consider your products. :)
Your photos look pretty good to me. I would just suggest taking photos of the coasters with a cup displayed on them so that people can see them in use!
Hope this helps, and good luck!