Your shop hasn't been open that long so be patient.
You've received a lot of good information above, titles, tags, photos. Use the seller handbook
http://www.etsy.com/blog/en/category/seller-handbook/online labs and all the other information here on Etsy.
I'll go through one of your prints and tell you what questions I'd have if I were shopping for a Marilyn Monroe print
http://www.etsy.com/listing/100487647/buy-one-get-one-free-marilyn-collectionIf I were a customer looking for a print of MM the first thing I would search for is black and white print of Marilyn...
not buy one get one free
There are two prints photographed are these the two prints I'd receive? What is the difference between all the different sizes do they all cost $20? What kind of art is this, original? pencil drawing? watercolor? photographic print?
I don't know anything about it. You need to explain it in great detail. And just mention other sizes are available. Otherwise it's just too confusing.