Hi Nick,
First thing I noticed is that all your listings have names that no one is going to search for. No one is going to come to Etsy and do a random search for "Amethyst Reflection." Try something like "16X20 Fine Art Print - Amethyst Reflection" or "16X20 Mineral Photograph - Amethyst Reflection" Your titles need to have key words that people will search for.
The same goes for your tags. You should try combining your single word tags into phrases. For example, in Amethyst Reflection, you tag it with quartz, photograph, natural, mineral... Try mineral photograph, quartz picture, natural photograph, natural print, natural art...
Also, is there a way you could include more pictures of your items? Try showing them in use. Hang them on the wall and take pictures. Show potential buyers what it will look like in their home or office.
Your products seem very unique because I tried to do a search to find similar things to help me give you ideas and I couldn't find any. I'm sure if you can find the right tags and titles, you'll have great success.
Good luck!
Hunter