Some of your listings are not set up for search engine optimization (SEO) at all.
To make a sale, your item has to be found buy a buyer. How does a buyer find your item? By searching. What would a person search to find a pink print? Would they search "pepto bismol?" Or "pink eye?" Or "blind date," "backlash," or "white trash?"
Search results on Etsy come from titles and tags! So your titles and tags should be filled with keywords and keyphrases that an actual user types in (check your Shop Stats to see what your top keywords are for the past year). Unless someone is looking specifically for a pink paint chip print, you have to capture search results with "art print," "pink print," etc. Think like a buyer.
I would personally title the pink print something like this: "Pink Art Print, Paint Chip Art, Fine Art, Pink Abstract Art, Office Home Decor, Upcycled Art, 8 x10."
I typed "pink print" and "pink art" into the search bar and let it auto-complete so I could see the suggestions it gave me.
Your tags are also in dire need of help. What does "blind date" have to do with your item? Even if one of the colors is titled that, it has absolutely nothing to do with your item. Your tags should describe your item: pink art, fine art, art print, home decor, office decor, pink print, pink colors, gradient, paint chips, paint chip art, etc. Also, you might want to consider using words like "upcycled" to describe your art.
When I'm in doubt, I read Etsy help articles and blogs. This is a great place to start:
http://www.etsy.com/blog/en/2011/the-etsy-seller-handbook-all-our-how-tos-about-selling/You have an interesting product and I'm sure it would sell if you tighten the nuts and bolts of your shop.