Hi Chrissy let me take a look,
I love your banner,you are a worldwide merchant which is very smart..
Now for the critique..
Photos...I'm conflicted as far as your photos. They are crisp and clear and the backgrounds do go with them well..I am conflicted because I normally advise a White background to help your photos pop AND to help encourage people to add you to treasuries.
Titles.... I think yours are great but you need to put the keywords in order of importance. Think of yourself as a customer looking for your product and place the two most important search terms first.
http://www.etsy.com/listing/117719325/o-is-for-owl-personalised-nursery-artFor this one I would put
Personalized Art - O Is for Owl Nursery
Tags...Similarly think of what your target customer would search for to come across your product..singular terms are ok (personalized,art,print) you get more mileage out of compound terms (personalized art,custom art,nursery print,handmade art print,handmade art,etc..)
Inventory...Obviously you need to hit that 100 mark to really get people buzzing about you so you will have to expand upon the alphabet concept and add numbers or perhaps sentence structure (school house rock anyone?..conjunction junction what's your function..eh humm sorry got carried away :))
I hope this helps! Let me know how it goes :)