I think your stuff is really quite nice, you just need more listings, to get noticed more often. Also, I feel like art is one of those things where I find what I want to buy when I'm just browsing. The right art for me just calls my name when I see it. I know that doesn't help you get sales, but if shoppers buy art the same way that I do, it would pay to have more listings, and get noticed more often.
Good luck to you!